Step Daughter Bored?

Heyy everyone, just need a little advice here. SO and i met his 7yr old daughter back in Oct, after not knowing she existed up until then, so having a step daughter is do very new to me. I was in her position as a child, meeting my own dad at age 9. My SO and i currently have 2 children together.

So SD came over Friday night, then we went to some friends for dinner, then Saturday, all 3 kids had their little howlers league from 10-12, we came home, the kids played video games for an hour, and then we had to leave for my daughters softball practice and immediately had to meet SD mom for pickup. Well, later on that night, the mom texted my SO saying that SD didn’t want to leave yesterday but apparently doesn’t want to come on the weekends anymore because “she’ll be bored” she wants to “do fun things” when she’s here. In my experience with this women, she is very manipulative and controlling situations to go her way, so i can’t tell if it’s Mom putting words into SD mouth, or if SD actually feels like this. And it’s hard to talk to SD about this, because how do you go about having this type of conversation with a 7 year old? I feel, personally, that mom should have had a conversation about things are not always going to be fun when visiting your other parent. Especially since we had limited time due to mom wanting her back immediately after my daughters practice, where she had a total of an hour at our house for Saturday where she never expressed being bored as they were playing video games until we had to leave for practice. I guess I’m just kind of distracted, because we are also in the process of buying q house and our closing date is quickly approaching so we are in the midst of packing as well, we don’t have any extra money to go do anything fun and we didn’t have time to go to the park or anything the entire time she was here. She has never expressed boredom with us, so i just need some advice on how to proceed, thank you <3