I'm pretty sure she would deny it, even if she was dressed just like me on that day. I love her very much. I will not avoid her just because of this.
Yes, as soon as I leave, she will lose access to my personality and products. And I will not be this irritated. But when I see it happening argh!

I hid the body lotion and the rest of my stuff in my bedroom. But I feel so mean. Selfish. I'm her daughter. She gave me everything I needed anytime I needed. If there's only one slice of bread left in the world, she lets me eat it, if I'm cold she gives me her jacket, if I want to dress or borrow something from her, she has no problem at all with it - the difference is that I can dress any of her clothes with my own style, not to copy her (which I'm sure she would love if I did). This woman does everything for her kids. She's very kind and patient, but this imitating thing...gosh.
I never found a solution in other forums. I googled this copycat thing before several times and all I see is the copycatted been annoyed like I am, and people saying take it as a form of flattery, or the case is very different, and the mother is also narcissistic and defying, or tell them to confront the copycatter...
I guess theres's no real solution. She obviously won't stop it - I'm not even sure she's aware that she does this. What coudl I say? "I don't like that you dress like me, wear the same products, repeat my jokes and theories, cook the same things I cook, because I think you are disrespecting my individuality by making yourself a copy of it" ( I don't even know what I feel...). She would say "What? Are you crazy? I like this and that, I always liked, always used it...." Just like she says with her hair color. How many times have I confronted her with the hair dye. She wants to convince me that she always used that color, it just got lighter now, for unexplained reasons...Not only she doesn't admit she started buying my hair color, she also doesn't feel embarrassed and stops wearing it. She could admit to herself and slowly stop doing it, but no. Now she also wants the highlights. (She never liked to see herself with light hair, she made fun of highlights and even today she said "everyone wants to be a blonde nowadays", to which I immediately replied: "Says someone who just dyed her hair light brown...". "That's different". Yes, I know, you don't want to be blonde, you want to be me!
I can't force her to go back to her things, I'm trying to ignore her hair, that is right in my face, the rest I will selfishly hide. Who cares. I need my sanity.