Maybe look at it more positively…
perhaps you now have a new daughter in law
Honestly, it's time to let your daughter be an adult.
Tell her to stop complaining to YOU and fix her own shit.
She sounds like she is just as much of a whiny brat as your son in law.
At some point children need to grow up and take responsibility for their lives.
SHE needs to do this, NOT YOU.
Next time she starts complaining to you tell her to STFU and fix her shit.
You don't want to hear it anymore.
Then go get a pizza with her.
I bet if you do this her eyes will bug out and in a week the shit will be fixed.