Am I justified in feeling this way?

Destiny

My boyfriend and his mom live up and down in a two family house. I have my own apartment. I came to his house for a few nights with our 4 month old son. While I’m here my son goes up for a few hours a day to spend time with his grandma. The night before last his mom offered to let the baby sleep upstairs with her so we could have a date night.

The next morning she sent a text saying that she needed a bottle. We were up til after 4a so when the text came in we didn’t hear it. She sent another text about 30 mins later asking if we were up and to bring a bottle upstairs. About 15 mins after the second text she called me, which finally woke me up. She said she needed a bottle, so I just went upstairs and got him.

Now here’s my issue (and I’m not sure if I’m justified in feeling this way).... Why would she let my son sit up there with her for nearly an hour before she called? Why didn’t she come downstairs and barge in like she does any other time she needs/ wants something from down here? Why didn’t she send my boyfriends oldest son down to get the bottle or wake us up?

I’m extremely bothered by the fact that from 9:07a to 9:56a she was sending text messages and calls instead of figuring out another way to get my son fed. Or is my fault for not waking up right away? Like is that not her responsibility as his grandma?