My MIL no showed our baby shower today...

Cara

She didn't even tell us she wasn't coming. She told my SIL that she just didn't want to. My husband thinks she must have a good reason but when he called she said she was tired. I don't think this is an excuse at all and I'm really upset about it. My husband keeps trying to make excuses for her. I'm very hurt by this and feel like nothing I do is ever good enough. I used to feel like I wouldn't matter until I gave her a grandchild and now I am and I still don't matter. Am I being ridiculous? Is being to tired a good excuse? Is this worth fighting with my husband over? How do I protect my child from this?