No, I couldn’t read the messages either!
I assume they had a disagreement/falling out in the past, Ellis has, in between solving all these murders, tried to make amends, and finally, Grace, the daughter, has responded, willing to meet up maybe, or just said “Hi Mum”, making it all ok.
Probably, as often seems the case with detective stories, her work has come first, leading to family feeling left out and second best.
Ellis has mentioned being on gardening leave in the past, no doubt time off trying to sort things out, but has been lured into returning to work.
”We need you, Ellis, you’re the only one who can find this killer….”