Aww, no need to get rid of her! Sounds like a couple thing doing on here - the nipping at the ankles is definitely play - so get some toys that let her leap and attack them instead of humans! The "feather on a fishing pole" type is a good one, an make it a routine to have a good long play session at least one a day. Tell others to play with her as well, fetch or whatever will wear her out, and give them some enjoyment too!

The stray cat that come around is obviously another issue - do you know who it belongs to? She is seeing that as an invader in her territory - when she gets focussed on that, do NOT try to pet her. Block her view of that cat, and bring out the "fishing" toy or something else she can focus her energy and attention on.