Boas seem to catch on fast to constricting prey- they're not known for being "shy"-Fun snakes to keep around.
That size sounds good for the foreseeable future- beyond that, it's a wait & see. Snakes grow their whole life, & no way to know how long she'll live- it comes down to good genes, good luck & good care. She's got you, & that seems to be in her favor, anyway.