Invited mil to come and stay over the bank holiday weekend as in come up on Friday and go down Monday. Don't really get on with her and find her easier to cope with in small doses. Anyway she rang last night and said that it was not worth her coming for just three days but would like to come up on the Thursday and go on the Tuesday because she would save £30. She lives in London and we live in Yorkshire. 
Firstly I do not want her to come for that long as it will be down to me to entertain her whilst DP is at work (retail so will be working the Monday) and secondly I have booked to have the Friday off as I have not had anytime off from work since a long weekend away in January and the whole company is currently going through redundancy. I find out on the 3rd if I have a job - so would quite like to have the Monday to just chill.
DP doesn't seem to think this is a problem as it is not set in stone but I can see it happening and it being left to me to entertain her. AIBU (probably am though)?