All perfect praise be to Allah, The Lord of The Worlds, and may His peace and blessings be upon our Prophet Muhammad and upon all of his family and companions.
It is prohibited for a woman to kiss or touch another woman out of lustfulness since this is a vice that kills virtue and incites evil thoughts. Therefore, it is obligatory that every woman, who has committed a similar sin, to repent at once, ask Allah for forgiveness, and beseech Him help not to commit that sin again. In conclusion, you (Questioner) should sever your ties with the aforementioned woman because if you didn't do that Satan will adorn to you committing the same sin and drag you back into a life of vice. And Allah Knows Best.