Yes, as others have suggested, maybe she lost her memory (was in a coma?) to begin with, & then later regained all/part of her memory & then either saw Toadie was happy now & decided to stay away, or just thought too much had happened etc & never went back...
I have seen people suggesting that the red-headed woman Andrea saw when under the latest hypnosis was probably Magda Bliss (Dee's mum) - see attached picture. And that possibly she gave Andrea up as a baby/infant & was checking that she was ok with her new 'mum' (ie that was what Andrea was remembering under hypnosis).
https://neighbours-soap-opera.fandom...ki/Magda_Bliss