Having issues with my Grandpa's new girlfriend?

My Grandma died two years ago (we were as close as two peas in a pod) and he's been dating this woman for a couple of months. He lives in Minnesota and I live in Maine, and I've only met her once before. By the way Im in Minnesota for a week. Before I left to visit him my mom said she wanted to sleep over for the week and take care of me, ex: make me breakfast and do things with me while I'm home alone at my Grandpa's house, because he works in the morning and doesn't get home till 11:00am. I know she is trying to help, but this isn't necessary, plus (I don't want to say this to my papa) but it bothers me when there is someone other than my grandma sharing a bed with my papa. (She has a condo, and doesn't usually stay nights with my papa, in case you were wondering.) This doesn't bother when I don't come to visit, but I does while I'm here. Also when my Grandma was alive she and my papa would always focus all their attention on me because they see me for two weeks a year. But now (not to sound selfish) I feel completely invisible. My papa is spending time with his girlfriend more than me, which I don't think is logical considering they live five minutes from each other and they can see each other anytime and I get to visit him once a year. I don't wanna be selfish but it DOES bother me. It's not that I don't like my papa's new girlfriend, in fact I wouldn't want him to be with anyone else, but I feel like she is trying to be my grandma and she isn't. I always get a box of candy when I go to Minnesota and she took it away saying I could have it after dinner, versus my grammy who would buy me so much candy I would get stomach aches. Also she wants to take care of me by making me breakfast in the morning but im perfectly capable. Should I politely talk to her or my papa in private, and tell her how I feel, and how I miss my grandma (if so what should I say), or should I not talk with her or my papa cause it would be rude.