I need advice...

A certain daughter is behaving strangely toward me these days. If I try to make an appointment (yes, appointment) to see my Grandbaby, it's like pulling teeth. Either she has an excuse as to why she won't be home or she does not reply to my texts or phone calls. I can't think of a thing I've done to make her mad at me and with the twins coming soon, I'm afraid I won't be able to see them either. Any thoughts about this? I've tried talking to her and all she says is she's been busy. I can't believe she doesn't see my texts because her phone is an extension of her hand but she ignores them. I'm going to see her today and am not sure if I can't hold my tongue about all of this. Give me strength because I don't want to upset her with only a few months for her to deliver. Advice anyone?