suddenly keeps trying to invite me to her house in the day-time when she knows I work full-time?
I have a friend who I've known about a year now and she has suddenly started pretending she doesn't know I work full-time (week days only usually) and she has been asking me to come to her house like on a Monday morning and when I laughed it off (thought she was just having a laugh) and said 'Oh no I can't silly it's Monday morning , ya daft thing haha' she then asked me the very next day to come to her house in the middle of the day, this time she was a little hurt when i said 'No sorry, i have to crack at work (am in the middle of a serious work issue at that moment which she did know), but she just said please come and that she'd already told her kids I was coming. 
I'm so confused, she has ALWAYS known me to work full time in the week since we met.
Has anyone got any clue or previous experience of friend doing this to help me figure as to why this is happening all of a sudden?
My DH says just say no and ignore any pouting just and get on with my work as usual until she asks me to do something more normal (ie not impossible) but I'm now left feeling so confused that she suddenly forgot that I work and also seemed almost put out by it this week.
This is new to this week, she always knew that I worked before, in fact she's looked into a similar line of work and asked me all about the hours and what''s involved etc so no confusion there about when I work.
Although she has text me in work time before but I just get back after work when I've seen it and she's always been happy with that before now.
I must just add, I do like her very much, she is nice and kind and a lovely caring friend. I'm just so confused by this week and wonder if anyone can think why she now thinks I can stop working and just go off to her house instead?