Are these mushrooms still edible? Are these mushrooms still edible? The colour of the gills changed.

I'm not sure what kind of mushrooms they are. They're not store-bought though, my mother picked them from the forest. She also washed them straight away. They've been stored in the refrigerator for 5 days. No off-odour. Gill's colour changed from light brown to dark brown-black.
No - not edible, is the only responsible answer to this question. From the given information and photo, it's impossible for someone on these message boards to positively identify what you have.

The saying is "When in doubt, throw it out". As with all foraged mushrooms, don't eat it if you are not able to 100% positively identify it. This goes for fresh and as well as 5-day refrigerated specimens.

My background: 3 years experience foraging local wild fungi in midwestern USA and scientific fungi identification.