Feeling guilty

A few weeks ago, the city had a HUGE second-hand sale on baby clothes and toys. My MIL texted my husband and I the information.

She told me that she and I could go together and I said of course! Then my husband said he wanted to go too so I texted her that all three of us could go together. She said that was a great idea.

The weekend comes for the sale. I text her the night before on where we should meet. She texts me back that she doesn’t want to go anymore because she thinks with three of us, we’ll lose track of each other. I said, “are you sure? Wouldn’t be s problem“. She said, “yes I am sure. I can support you another way another time“. I said, “okay, just text me if you change your mind. We’ll be meeting at so and so at this time.“

My husband and I go and we run into her in the city! She was by herself but I thought it was odd that she was down in the city anyway.

So I’ve been doing a lot of baby stuff on my own because with my flexible schedule, I end up going alone most of the time. But this makes me feel guilty because my MIL has yet to do anything with me and the baby.

I really wish she had just gone with us to the second hand sale, then I wouldn’t worry so much.

My sister said that it is not my job to make sure she is happy. She had a chance to do something with me and she chose not to. And being supportive is not a button someone turns on and off. She should’ve gone with me and that I shouldn’t feel guilty. My sister thinks my MIL was trying to manipulate me (Which she has done with me and all of her kids, including her husband. She likes to play the victim card)

Now that I have all of my baby stuff, I’m not really sure what else I can do with her.

Am I wrong for being frustrated at her for not going with us? What should I do to make her feel involved?