There's a series of picture books that really helped me when I was first diagnosed - aimed at child-alters. It mentions how time has passed and why that may be confusing for your little girl.
Dear Little Ones: Amazon.co.uk: Jade Miller: 9781507843437: Books
Kind regards
ACrystalGem
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Borderline Personality Disorder, C-PTSD, DID, Depression, Anxiety
I have a FREE short story about Sci Fi and Mental Health - Billie Prime, available at
https://writteninshadows.wordpress.c.../billie-prime/