My (ex) best friend wants me to meet her son, I don‘t know what to tell her

First time on here and English is Not my first Language so sorry for any mistakes. My (24F) former best friend (24F) and I have what you would call a complicated relationship. We practically grew up together since elementary school. Over the years we had more than one big fight, followed by a couple weeks of no contact. The reasons for these were various but overall it often was about my bounderies. For example, She Never had many friends in real life and while I struggled with that myself, I was able to find some like-minded people while she mostly kept to online friends. So she would get mad when I wouldn‘t have time for her spontaneously because I was with some other friends and when I told her that I would be happy to plan meet-ups with her so we could See each other she got Even more mad and that‘s how we ended up fighting with no contact after. I Must admit that she acutally made an effort to change after these „fallouts“ and that was always the reason why I gave it another try. Besides, Over the years, we grew closer and closer, her mum was more of a parent to me than my own father at the time. So I didn‘t want to lose my sister because that‘s what she was and kinda is.
In December 2023 we had our last big fallout. I won‘t go into details here but it was the first time in like 5 years that I acutally screamed on top of my lungs because I was so angry and hurt. We didn‘t speak for a few months after that. When she got pregnant at the end of 2024, she reached out, telling me she wanted to tell me first since we always planned this way and she wanted to keep her promise. I have to admit I was really touched by that. Since then we text occasionally if there is a major life Update like when my grandmother died or when her son was Born a few weeks ago. One time she just texted me to tell me a funny Story about a former friend of us that she had heard and wanted to share with someone who knew him too.
A week ago she surprisingly called me via videochat (we only had text conversations until then) to Show me and my mom her son for the first time. It was lovely and I really enjoyed it, though I Must also say that I also Liked our relationship how it was the weeks before, I was able to live my life in Peace by keeping a distance while also Not losing her completely.
Now, I‘m Not employed at the Moment and since she‘s on maternity leave she has often dropped how boring it is to be at Home all day since Little one is almost too easy of a Baby and does Not really keep her busy (this is her way of trying to make me ask her to meet up, she always has been kinda manipulative). Today she texted me asking if I would be willing to meet her and her son for breakfast since I also don‘t have much to do at the Moment. I‘m pretty unsure here. On one side, I still feel like she is my sister and that is my nephew and of course I want to meet him but on the other side I don‘t know if I want to get this close to her again, you know? How do I deal with all of this?