The world and it's mobile phone!

Feeling really irritated with my DD. She's 27, been living with me for 2 years since the birth of my DGD, and her partner also.
DGD is now over 2, a bright, intelligent, imagination sweetheart. When I look after her not a tantrum or tear as I spend time playing with her and reading etc.
But my daughter literally sits in the sofa on her mobile for hours, completely ignoring her, and then only seems to talk to her to tell her NO. I've tried talking to her about it, but that's not worked, she takes offence I'm telling her she is a bad mum, which she isn't. When she finally puts her phone down she is great. But it seems to be more phone than not.
Now I say nothing because it causes friction. I had hoped by my example seeing how less frustrated my DGD is, she would see its a matter of some quality time..... but no.

We are in the era of mobiles.... am I being unreasonable?