Childcare shaming

I'm going back to work in a months time and had been having trouble getting a childcare place. 
I was telling my MIL that I found a place with no waiting list and she slammed me saying there must be a reason this one doesn't have as many people wanting to go there. 
I said I can always send my daughter there until a place comes up at the other center. She said even sending her in the short term isn't good enough. 
I have no other option otherwise I'd have to quit my job which I can't afford to do. 
Now I feel like an awful Mom for considering sending my daughter.