Mello

So, I've been with my girlfriend for about a year now. We've known each other much longer. She has 2 daughters, a 2 year old and a 7 year old. We used to be good friends a couple years back before she had the 2 year old. So, I've known her older daughter much longer. Me and the kids always got along great. The older one absolutely loves me and is always asking for me to come over and spend time with her. When I am there 90% of my time is spent with the kids, playing with them, entertaining them and whatnot. The only time I spend with my girlfriend is after their bedtime. The youngest always loved me as well, always wanted to play and interact with me and even call me randomly on Facetime. We would sit and play for hours, I would wake her up in the morning or put her to bed on the days I was there and she would always be so happy. However, suddenly the youngest despises me. Any time she comes near me she instantly starts yelling "NO!" and swinging her hands at me to hit me. She refuses anything from me, I can't even fill her juice up without her flipping out. I first have to hand the cup to her mom after filling it so she can give it to her. It's strange sometime she'll call my name for my attention and she'll be happy/giggly for maybe a minute. Then boom right back to "NO!" and hitting/being mad. I don't really understand what I did. I've never done anything mean to her, I'm constantly just trying to make her happy. Her mom doesn't think much of it and kinda just laughs it off. But it honestly bums me out. I really care about her and both of her kids. So, it's just kinda disappointing that she's completely 180'd on me out of nowhere. I still get along great with her older daughter. Am I just trying to hard to please her? I'm not sure if I'm doing something wrong. Any advice would be appreciated.