and if so, how do I tell her?
Mostly (at weekends) she just turns up whenever she wants and then expects a cup of tea etc etc. Yesterday she did at least tell me that she would "probably" pop in today, but she didn't ask me if it was ok, or tell me when and it is starting to piss me off.
dh thinks I am being slightly unreasonable as I will be in anyway (and if I'm not I won't see her) but it irritates me that I don't know if or when she is coming.
Even more annoyingly she has somehow got hold of a spare key, so sometimes i'm not even aware she is here until she is in my kitchen.