I hope that I'm not alone with this! My elder calls for her mother, even though it's just me and my other relative. We come to her and submit to her demands, but she calls us Mom or Mommy. I'm her granddaughter, and she confuses me and my other relative as her mother.
I tried introducing myself, but she still calls me Mom or Mommy. She's not diagnosed with dementia or Alzheimer's, but she is nearing her end of her life. Why is she confusing her mother's names with ours? Do you have other ways than introducing myself to cope with this?
I would not try to correct her, or maybe call yourself Aunt Susie or whatever your name is. Be flattered that you are good enough to her to be mistaken for her mother. I just love "the truth," but it isn't very important to someone in their last years.
If it makes you uncomfortable, try to figure out why. She is thinking you are the young and pretty mother she had when she was a girl, so don't be worried about needing extra wrinkle cream. If she appreciates your care, let that be enough.
Cope by entering her world. Encourage her to share her memories. Let her talk about school, about games she likes, about dating, etc. Don't worry about what she calls you. She knows you are important to her well-being. That is a wonderful, loving gift you are giving her. Accept "Mommy" as high praise.
Now my husband has a a grandma stil alive -she is 97- in an assisted living place -with much assistance now- and she forgets who he is now. She was trying to list off her grandchildren's names-my husband did not ask her to she just wanted to for some reason-and she listed them all off but could not remember his! She kept going "hmmmm, now there is one more---who am I missing--?". And my husband was right there -he was the only visitor there! He just smiled and waited and then she said"why-it is -his name-- "and then she turned and giggled! And said "that's you, right?" and they laughed together. She is very sweet to him ( but I think she is a stinker to my MIL -her daughter-like so often happens)
I just think if they cannot remember who you are they will just forget when you remind them.
You're taking good care of her, be secure in that. If she wants you to be Mommy then be Mommy.
eyerishlass gave you some great advice there. shes pretty sharp..