Its not that I don't want to see my friend or spend time with her, but eg if i suggest something like a coffee at mine.. she then gets wind I've got some free time and suggests several hours - or even half a day - out. It was supposed to be an hour ish at mine. I no longer suggest coffee at mine.
We both enjoy a local breakfast.. but again, that gets turned into an hour dog walk plus breakfast time and before i know it its taken up most - or even all - of the morning.
How do I politely manage this ? If i say I've got plans and I'm limited for time, she then gets quite miffed with me.