My girlfriend (28F) was so lyrically overprotective in front of my step moms (40 F) it was embarrassing. How can I talk with her about it?

My dad got married to my step mom when I (26 M) was 10. My step mom is very nice, she became my mom basically. She is very fun and bubbly and always was so lyrically overprotective of every member of the family like she would make you sit down when you walked home after a long day, or to make you a cup of hot chocolate when it started to rain outside. That's her love language. Always has been. She became my mom basically and im as much her son as my real siblings are. She always spoiled me and our house became the house where everyone would come home to when they were feeling sad or upset. so the expectation on the overprotection is always hight. In fact, the more you leave the house, the more food you take with you. I know it sounds crazy to anyone but it's worth it. it's very lovely once you get used to it. I wasn't used to it at first either.<br><br>Now to the problem: I've been dating my gf (28F) for 3 years. I took her to my family home last weekend because she finally agreed to meet them as our anniversary is coming up. I wasn't expecting stepmom to go all out but she did. I warned my gf about the overprotectiveness but she didn't really believed me. Well. My step mom went all out. She made us sit, she made us some food, she called my older brother to pick up some icecream from the shop and all. My gf kept telling me how nice it was and how lovely she is.<br><br>The problem is when it got over. After a while my stepmom stopped being overly nice to us both and started being overly nice only to my gf. My stepmom would make her some tea, some coffee, some food, the works. Feed her more, make sure she's warm enough, if she coughed, seams and all. It was so embarrassing. My gf is really nice and everything but jesus christ. My stepmom did the same for my older brother's wife so I guess it's just for the women but it was just so crazy. My gf is a very easy going person and she took it in her stride but I can imagine other people getting annoyed at it.<br><br>I did try to talk to my stepmom about it before hand but she told me to shut up. How would you talk to her about this? I don't want her to be mean but this is a bit too much.<br><br>**TL;DR! My stepmom was super duper nice to my long term girlfriend so much it was embarrassing. I know she means well but how do I talk to her about it?**