AIBU to be a bit miffed?

[cakeismyfriend]

Hi,
My mum didn't call on my daughters birthday, she was 4 in January. When I mentioned it to my mum she was very defensive (this is usual), and said she was too ill to call or text. She has no underlying health issues and said she had food poisoning. I'd already spoken to her a couple of times since my daughters birthday before bringing this up and she had mentioned she'd been a bit ill. My mum did attend my daughter's birthday party (on the Saturday before her birthday). She was there with her fiancee and spent most of the time talking to him. Also, clearly bought whatever she could find at the local Sainsburys for my daughters birthday (knickers that are the wrong size- that's all they had apparently). I genuinely said thank you for the gifts as not bothered about presents, just gives context.
Thanks for reading!
AIBU to be a bit miffed that Mum didn't just say sorry?

I imagine as your mum had attended your DD's birthday party she didn't see the need to ring her up on the day as well.

Was your daughter bothered? If so, why couldn't she ring her grandmother?

She's probably defensive because she's embarrassed she didn't call and realises she ought to have. I didn't realise you had to be at the peak of health to call/call someone! Can't stand lame excuses.

It's difficult to say without knowing more. Is she perhaps more involved with her partner at the moment?
Knickers are a rubbish gift for a four year old!