WIBU in this situation?

[NowIKnowMyABC123]

I'll not say who I am in this yet so I can get opinions.....

Last weekend friend A was invited to the wedding of close friend B's daughter.

Friend B has made effort with A over the years and they are good friends but they are worlds apart in terms of life - B is in her 60s, A is younger and has young children.

B adores A's children. A does make effort with B and is usually the one travelling to B to facilitate them seeing each other.

A has a chronic hidden disability and also one of the 3 children has SN.

A few days before the wedding, A texted B to say that her toddler had been poorly with D&V and that A was also feeling quite poorly with a flare up of her illness.

A therefore did not attend the wedding of B's daughter.

B is extremely upset and has reduced contact considerably.

A apologised for not attending and asked for pictures and sent on a gift.

B is not pleased and thinks A should make more effort.

A does tend to cancel some events last minute citing illness .

A does attend some important events (e.g. Hen party, big birthday party etc) but not all.

B has attended all important events hosted by A .

Does B have a reasonable reason to be annoyed at A?

You HAVE to go to work if you don’t want to be sacked you do not have to attend a social engagement.

It was her toddler who had D&V

I do sometimes feel my friend uses her illness as an "excuse" but on the flip side I do know her illness can be awful for her

i think you have a rather flippant attitude towards her chronic condition which isn't very compassionate given you think you're such 'good friends'.

Living with and managing a chronic illness is exhausting in itself and fucks up 'routine' and 'normal' day to day life. This woman has the added stress\job of raising young dc-one of whom has additional needs.....and yet you assume she uses these valid reasons as an excuse?
Where's the understanding and compassion from YOU- her supposed ' good friend'?
You still expect her to do all the running around to keep up contact

Might i suggest you stop being so self absorbed and try doing at least 50% of the running around?