Assuming you trust this person, what would your reaction be?

It's almost 10pm here and my sister texted to see if she could take my 2 and 3 year old from Friday night until Sunday. It's DH's birthday Friday and mine Saturday, so I'm thinking she's wanting to give us a break for our birthdays. I was caught off guard though because it was so last minute! We had plans that involved the girls but I'm thinking a free weekend sounds amazing right about now!