To be fair to your daughter, fit in this context appears to be slang for gear/clobber and drip or drippy roughly translates as extremely cool.
Heaven help us all.
I’d just ask her to tell you who sold her the drugs, and then ask if you can have some.
Alternatively go on urban dictionary, which suggests it’s a term used to denote that the wearer’s outfit is (or should) give the wearer extreme confidence/swagger. Although she’s got it wrong, it should be...