You said you had plans tonight, correct? Make sure she has what she needs, tell her to make herself at home, be very mysterious/shiny/bright/flirty then head out as you planned to do.
You need to show her two sides... the family man and the new sexy mysterious man IMO.
Honestly, it seems fairly obvious she softens when she needs you for something. Keep that in mind but since she will be in your home for a few days use the opportunity wisely!
