I agree with all the other posters and the helpful links and advise. I think your mother sounds frustrated in general and she's taking it out on you. It also gets more difficult when children become adults, yet the parent still takes the liberty to criticize. There's now 2 adult women in the house and personalities can clash.

You mentioned there's stuff out of order due to lack of space. Maybe you can both do an overhall of your storage spaces. If you haven't worn it in a year give it to charity. If you live where there's 4 seasons - store away summer clothes. Throw away anything that doesn't qualify for charity.

That's very unfortunate she couldn't empathize with you, when you explained how you feel. Do you have any plans on living on your own? In the meantime try to figure out what are her main irritations and keep your things organized. Sorry you're in this situation.