Well, by all means everyone change their plans to accommodate your mom.
This is how my Mom tries to operate and she is getting less and less cooperation from her kids.
I can understand it's a difficult situation for you, but only as much as you are willing to let it happen.
Been there done that.
This is the life she chose and she will have to make the sacrifices as you have had to make them too.
She will simply have to change her travel plans to better convenience everyone.
purps