Yes, she should be able to fast-track with you: she should have her passport on her at all times for proof of age/citizenship. Do be aware though that a 129 €, 3-day adult Passlib only comes with a 2-day Paris Museum Pass so you'd have 1 day when that part of the package will not apply.
There are also a few attractions which do not allow fast-tracking even with the pass so read the specifics of the Paris Museum Pass carefully. While you can skip ticket lines with this pass, you cannot skip security-check queues. This usually isn't an issue as they move along quickly but it IS an issue at some, such as Versailles. That one is especially notorious for having very long, slow security queues but with so little time in Paris, I would skip Versailles anyway.
Here's the FAQ page of that pass:
http://en.parismuseumpass.com/rub-faq-16.htm
Regarding EU citizens under age 26:
http://en.parismuseumpass.com/rub-faq-16.htm
But again, I think you're spending much too much for the Passlib. A 2-day Paris Museum Pass is only 48€ if purchased on its own, and you can get a carnet of 10 individual-ride t+ metro tickets (zone 1; which is most of central Paris) for just 14,90 € versus the hoho bus on the Passlib. A 1-hour Bateaux Parisians cruise is only €15 if purchased on its own. The Museum Pass does not cover the Eiffel so you'd have to find another option for that but still, I don't know as I'd spend 149 € just to have that covered.
https://www.ratp.fr/en/titres-et-tarifs/t-tickets
https://www.bateauxparisiens.com/english.html
The transport piece of the Passlib (Paris Visite) will not cover you to/from the airports unless you add that option at an increased price. Honestly, Passlib looks like just another version of the Paris Pass - which almost no one recommends purchasing - with the only difference being the Eiffel option.