I need advice!

I’m thinking of keeping something from my MIL and I need advice on whether or not it’s a good idea. My daughter will be 3 in July. She’s smart, she talks a lot but we still have such a hard time understanding her. I’ve been setting up play dates with my friend’s children and she has no interest playing with the kids. Kids completely overwhelm her and would rather just play alone. She also constantly repeats herself. For example, she will see a bird and go “a bird!… a bird!… a bird a bird a bird” at first I thought she was doing it because she wasn’t getting our attention but then I realized she just repeats a lot of words. She makes good eye contact but sometimes it is hard to get her attention. Normally I would just say “okay normal toddler behavior” BUT my husband is on the spectrum. So I want to get her screened, because if so then I want to stay on top of this. But here is where I’m in an uncomfortable situation. My MIL is very involved in my daughter’s life. She has worked with her endlessly on teaching her things, practicing writing, etc. she’s been great, but I don’t want to mention to her that I’m going to get her screened. I feel that if I tell her I think it’s a possibility she is on the spectrum, she is immediately going to tell me “no she’s not, she’s nothing like her father, I would know”. It’s common knowledge now that girls show it very differently than boys but she’s not an easy person to say “well I think you might be wrong” Is it wrong of me to basically hide the fact I’m bringing her to children’s therapy to get her screened even though she is extremely involved in her life? I feel bad but I just really don’t want to have to deal with the backlash of her and her opinions.