Toddler

So this has been bothering me for a while and it seems to be happening a lot more now and I’m starting to lose my patience. My boyfriend and I live together with his 2 and a half year old daughter and before I started working I was at home with them all the time and she was always great. Now that I’m working she has started to be a brat towards me. There was a whole week where everything that I would tell her to do she would say no and not listen to me at all. She moves around a lot from our house to her grandparents house to her Mom’s Dad’s house then to her Mom’s house ( not exactly in that order). Now it’s just getting worse and it’s just making me not want to be around her anymore. She doesn’t treat anyone else the way she treats me and it’s just making me angry. Am I overreacting? Will this eventually stop? I don’t know what else to do. I’ve taken away tablets and TVs and she just doesn’t seem to care