mother and ultrasound

I have my next ultrasound coming up soon and with my first pregnancy my mom was in another state so this time we've invited her to come see baby with us! I'm very excited about it because I've always wanted my mom involved in my pregnancy. Well I told her we would probably have them write the gender down so my husband and I could announce it to family our way. Well she got all mad and basically made it sound like she deserves to know before even us. It just made me mad and now I don't know if I want her there. She always takes these things too far. Am I just being selfish or would you be kinda upset if your mom acted like this