The 39-year-old, who was last seen at her home in Tranmere on 18 October, was discovered on land bordering Poole Lane and Old Court House Lane in Bromborough on Saturday.
Ms Stevenson's family has been informed and is being supported by specialist officers.
A post-mortem examination is due to take place.
About 30 friends of Ms Stevenson, originally from Bradford, travelled to Wirral on 14 November to to join efforts to find her.
Ms Stevenson was captured on CCTV near Albany Road in Rock Ferry on 18 October, and police released the footage as part of the appeal to find her.
A 41-year-old man from Birkenhead was previously arrested on suspicion of murder and later released on bail.

Under US law, 40% of the corn harvest must be used to make biofuel, a quota which the UN says could contribute to a food crisis around the world.
A drought and heatwave across the US has destroyed much of the country's corn crop, driving up prices.
The US argues that producing much of its own fuel, rather than importing it, is good for the country.
The latest forecasts from the US Department of Agriculture (USDA) suggest that this year's corn yield - the amount produced per acre - will be the lowest since 1995-6.
Total production will be the lowest for six years, it forecast, due to the extreme heat and dryness.
As a result, the USDA is predicting further rises in prices. It now thinks farm prices for corn will average $7.50-$8.90 per bushel, a sharp rise on the $5.40-$6.40 per bushel it predicted just a month ago.
By Mark MardellNorth America editor
Writing in the Financial Times, the director general of the United Nations' Food and Agriculture Organization (FAO), Jose Graziano da Silva, said suspension of the quota would allow more of the crop to be diverted for food production.
"The worst drought for 50 years is inflicting huge damage on the US maize crop, with serious consequences for the overall international food supply.
"The situation reminds us that even the most advanced agricultural systems are subject to the vagaries of the weather, leading to volatility in supplies and prices, not just on domestic markets, but also internationally."
Concerns about the impact of the dry weather in the US pushed maize prices up by 23% in July, according to the latest FAO food price index.
But the US Agriculture Secretary Tom Vilsack said the biofuels standard was having a positive impact on the country.
"It is impacting in a positive way the cost of gasoline in this country - some estimates put it at 25 cents to as much as $1.30 less for gas because we have a biofuel industry.
"There are jobs connected to that industry and less reliance on foreign oil. The question is: Is the market responding to concerns about supply and the answer is yes.
"Exports are down just a bit and ethanol production is down from between 10% and 30%, depending on the part of the country."
By law, 13 billion gallons of biofuel must be produced in the US this year. The country's Renewable Fuel Standard, as the law is known, was designed to reduce greenhouse gas emissions and dependence on imported oil. It has long been controversial, with many blaming the quota for pushing up corn prices.
The United Nations is not alone in calling for the quota to be suspended. Livestock producers in the US, worried about the cost of cattle feed, also want it scrapped and the governments of China, India and France have expressed concerns about the policy.

The animal, nicknamed Menai, was discovered at Tan-y-Foel close to Anglesey Sea Zoo a month ago.
The zoo said it was the first time an Olive ridley turtle had been in the UK.
Staff, who took it to a vet, said Menai was now progressing to the next stage of its recovery by being moved to a larger tank inside their aquarium.
Zoo owner Frankie Horbo said: "As she is now so active we are hoping this new environment will allow her to start diving and moving around more, and may help to resolve some of her buoyancy issues."
She said records dating back to 1748 showed Menai was the first Olive ridley to arrive in the UK.
"It's incredibly unusual. The nearest breeding population is in Gabon, in south western Africa," she said.
Ms Horbo said Menai was comatose when she arrived but had managed to retain "a core of body heat" and was now back to her ideal temperature.
A woman who was found dead in woodland in Wirral is missing mother Anita Stevenson, Merseyside Police confirmed.
[NEXT_CONCEPT]
The United Nations (UN) food agency has called on the United States to suspend its production of biofuel ethanol.
[NEXT_CONCEPT]
A rare tropical turtle found in a serious condition after washing up on an Anglesey beach is more lively and improving every day, a zoo has said.