I don’t think it’s good advice at all.
Who will be “m’karev” whom?
The idea is for Sparkly to be mekarev others. Yes there is a danger of being influenced by those you want to influence, or by leaving a more sheltered environment (see comments on NCSY above), but in this case, Sparkly is already in such an environment in a non-Jewish college, and having a kiruv goal in mind might ensure a proper perspective in her relationships with her non-frum Jewish classmates. Often when given a kiruv challenge, the mekarev grows too because he/she is forced to think about things that might otherwise be taken for granted.