Nicole Clark used her mother Avril Stewart's bank details to set up online accounts.
The 30-year-old, from Woodside, admitted stealing the money between 8 August and 26 August last year.
Depute fiscal Robbie Brown told Perth Sheriff Court that the accused's mother had not recouped any of the stolen money.
Sheriff William Wood deferred sentence for the preparation of social work reports.

Richard Di Natale, head of the left-wing Australian Greens, argues reducing hours would boost productivity and allow workers more time with family.
Mr Di Natale said he was not suggesting a specific model, but workers would need to be guaranteed adequate income.
Australia's two major parties have not commented on the proposal, but it has drawn criticism from an economist.
In the dark days of the 19th Century, many workers in industrialised nations considered themselves lucky if they got Sunday off. The achievement of a 40-hour week with Saturday and Sunday off for many was a major landmark for the labour movement.
But some have tried to go further.
In 2008, about 17,000 government officials in the US state of Utah started working four 10-hour days in a bid to cut costs. The experiment didn't last: the five-day week was reinstated in 2011. Other US states have also toyed with the idea.
The Gambia recently scrapped its four-day working week, which had been designed to allow people more flexibility on Fridays.
But what is the ideal working week, and could the four-day week become more widespread?
Read more: How shorter weeks have worked elsewhere
Mr Di Natale said he wanted to start a national conversation on the future of work.
"It's time we recognised there are big questions we're not asking ourselves. What sort of society do we want to be?" he told the Australian Broadcasting Corp (ABC).
"We have some many people in this country who are working more hours than they should."
He said Australia could follow other countries in trialling a social security safety net to guarantee adequate income.
Economist Saul Eslake said he did not support the proposal, comparing it to France's 35-hour working week.
"The French are good at many things, but economic management is not one of them," he told the ABC.
"Their economy has grown at barely more than 1% per annum over the past seven years."

Coleraine's Peter Chambers and Englishman Will Fletcher are into the semi-finals of the men's lightweight double sculls.
Holly Nixon, Joel Cassells and Rebecca Shorten have all moved straight into Sunday's finals of their respective boat classes.
Chambers and Fletcher began the quest for a lightweight double sculls European title fresh from their gold medal winning performance in the first World Cup regatta in Belgrade earlier this month.
However they were forced to qualify for Saturday's semi-finals through the repechage after finishing behind Germany in their heat with only the winners progressing directly.
The duo regrouped and in the afternoon session held off the fast finishing Greek boat to take first place.
Ireland's Rio Olympics silver medal winning brothers, Gary and Paul O'Donovan, who are defending their European title won in Brandenburg twelve months ago, had to follow the same path as Chambers and Fletcher.
They were beaten by Poland in their heat but won their repechage ahead of Ukraine.
Enniskillen's Holly Nixon and her team mates Jess Leyden, Bethany Bryan and Mathilda Hodgkins-Byrne moved up from fourth place to second behind the Netherlands to claim an automatic qualifying place in Sunday's women's quadruple sculls final.
With only five entrants in the women's eight an exhibition race took place to decide the lane draw for Sunday's final with Great Britain finishing second behind Romania. The GB crew includes Belfast's Rebecca Shorten who is making her senior international debut.
Likewise Coleraine's Joel Cassells and partner Sam Scrimgeour were fourth in their lightweight pairs exhibition race behind winners Mark O'Donovan and Shane O'Driscoll from Ireland.
Cassells is aiming for a third European gold medal in consecutive years.
A Perthshire woman lost £2,020 she had stolen from her mother gambling at an online casino, a court was told.
[NEXT_CONCEPT]
Australia should consider adopting a four-day working week or a six-hour working day, a political leader says.
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Four rowers from Northern Ireland in the Great Britain squad have advanced from the heats at the European Championships in Racice, Czech Republic.