90's child with a problem

Help! I told my 7 year old daughter I'd buy her a tamagotchi and if she could keep it alive for a year, she could get a pet.

This was before I researched the original tamas and realised they only live a month max...

Ordered a gen 2, it arrived, I thought I'd look after it for a couple of days to check out how to look after it.
Long story short, I now have a happy little good care teen and I really really don't want to give it to daughter!!

- Am I a hopeless tama addict? Do I give up my little happy teen to the jaws of 7 year old neglect?

- If I can't bring myself to be separated, which tama is the best to buy for daughter?

Thanks!