From what we last saw of her, probably busy being admiraly. If they wanted to work it in for a future Seven appearance, they might touch upon Seven thematically having been another abandoned child.
I love TNG, but the show loved to hit us over the the head with how superior its version of humanity was to everyone else; and it's come out in the wash over the years that a lot of Trek fans didn't like the show specifically because of that aspect. Having one wry observer among a group of humans who've improved but admit they're still working on it is more likable than having an entire crew of humans who are constantly reminding us how perfect they're supposed to be. It's an aspect of the show that hasn't aged well.