Ok, so this hasn't happened yet, but I'm looking for advice.

Backstory: my now husband and I were friends back in 2011/2012. We grew apart but always remained friends on social media. In early May 2022, we began talking on Facebook and started dating mid-May. At this point, him and his BM were broken up only about 2 months, but they were still sleeping together and "trying to work things out". Not the best way to start a relationship, but we got through it. At the beginning, I was labeled as the reason they didn't work out, although she was living with the new boyfriend that she started dating in 2021 (before her and my husband broke up). No one in her family liked me. Which didn't really bother me unless they were rude to my face. In that time, I just made boundaries. If they can't respect me, they can't be at my house, etc.

Fast forward to today: her family and i get along great. My husband and i own a small laser engraving business and her mom and 2 sisters are probably our biggest customers. We vacationed with her one sister. Things are going smoothly which is a win for my bonus daughter and my son because they've also accepted him as my bonus daughter's brother.

The custody schedule used to be that we would have my bonus daughter every week and BM would get her every weekend. Something changed in BM's work situation and she had to start working some weekends. So instead of leaving bonus daughter with her bf, she asked if we wanted her during my husband's weekends off work (he works every other weekend). So we accepted.

Maternal grandmother reached out a few weeks ago, asking to take bonus daughter to dinner every Tuesday since she wouldn't see her as much. We asked for every other Tuesday since it would be taking away from time from my husband since he works 6p-6a. We all agreed. So here's where my issue potentially lies. The first week, we ended up taking bonus daughter, my son and a cousin to the trampoline park and grandmother invited us to have dinner with them after. We did. It was pleasant. Everything went well. She even tried to pay for everyone's meals and I basically had to force her to take any money from me lol. Yesterday she reached out and asked if we could take the kids somewhere inside since the weather is going to be crappy. So we agreed on the mall and she said about eating there after. I don't have a problem with spending time with her. But my problem is not having enough time. I had an order come in yesterday and I'm in the middle of another one that should have gone out already, and we have 2 big craft shows coming up, one this weekend and one next weekend, plus a few big ones in May. Would I be the asshole of I explained to her that I can't do this every other week? It's our busy season and I have a full time job aside from the lasering, so i already don't have a lot of time to work on things. I just feel bad because we are finally at a good spot and I don't want her to think I'm being rude. Also, not sure if it matters or not, but my bonus daughter is non verbal autistic so I'm sure it's easier for her and a comfort to know that there's another adult that can help and keep an eye out for my bonus daughter.