Kat Dahlia is NOBODIES rapper.
Nicki has done tracks with Lil Kim, Trina & M.I.A..
Remy is locked up, Missy is getting her life together personally and Foxy would be the only other female rapper worth Nicki working with.
OVERSHADOW?
Rap is a male dominated industry and Nicki is one of maybe 4 female rappers that get any respect form their peers whatsoever.
Outside of ATRL there are 5 female rappers: Kim, Foxy, Nicki, Remy & Trina.
Besides... majority of female rappers are jealous of her so whyyyyyy would she wanna work with any of them when she's basically erased them all???
Iggy nor Azealia had the nicest things to say about Nicki before they saw any success. So why should she be nice to them?
None of the other females rappers are on Nicki's level of accomplishments in music or business WHATSOEVER.
No need for her to do anymore charity work.