@idespisewasps
It's alright! I also have a book that I haven't updated in so long and if I do, it's rare.
But this idea as been stuck in my head for your book, so hear me out.
Baby Tara grows up to a toddler and brings back a little bit of joy to the DSMP for having her around but Tommy doesn't spend a lot of time with baby Tara, but she's obsessed with him (not in a creepy way). One day, Baby Tara finds Tommy crying and she tries to comfort him, so she tells him memories of when she was living with him in the past and Tommy realizes that his sister is back....
And the rest is up to you dear author T-T