Friendship advice

[Bissymum]

Hi
Can anyone offer advice please.
I recently declined an invitation to a night out with friends
I’d had a sickness bug and was not up to going out
I text my friend to say that and that hope to arrange to do something with her soon
She has read and ignored my message
And also dropped me out of a group chat regarding the night out

I’m shocked that someone in their 40s would behave like that towards me and not even bother to ask how I am

Suggestions please?