Is it unreasonable to ask my MIL to limit the time she spends on her phone when she babysits?

My daughter was telling me she was so bored today when grandma babysat, and I know it was because she spent a ridiculous amount of time on her phone. I just don’t know if it’s reasonable of me to ask her to try to limit her time on her phone while she watches my kids, or if I’d be overstepping