Pisces disappearing act

Hi guys I'm pretty new to this topic forum stuff -but I'm hoping for some good advice!

Im a cancer girl

Was dating a pisces girl-who had a pretty gnarly and dark past and thought things were going well-we went out a couple times, - I adored her aura and energy, like nobody I've ever dated, I felt very comfortable in her presence,- I got her flowers, helped her out with some design work and helped her in looking for a new job (which she got)

She poured her heart out to me in an almost vulnerable state but right after that she got super flakey and bailed everytime i asked to hang out/meetup-then I stopped contacting her because I got really fed up with her behavior

She contacted after a month and apologized that she was busy and moved onto a new job; and kept initiating conversation -I told her i was happy for her-she kept thanking me for everything i did for her but i told her don't sweat I but never initiated to hang out again

Then two weeks ago she messaged me asking for some help, appearing a little helpless, which she could have found out/have done from some of her other graphic designer/designer friends - (because she told me she has some) and I helped her out but completely brushed her aside giving her the cold shoulder - i have no utter interest in her anymore whatsoever but yes she did hurt me - but I just want to know is there a reason she kept coming back? is it a pisces girl thing-completely disappearing and then re-appearing? Because its absolutely mind boggling and quite rude

I have a feeling she might contact me again soon-because I feel like she's using me, but is there a nice way to tell her to politely leave me alone?