Dont get down about this behavior at all. Since she isn't a little baby, she will take a bit longer to get used to everything. But she will.
After she know everything is safe and it all becomes a bit more familiar, she'll warm up fast. Just remember, you have known about her and already fell in love, she is just confused and don't know why she is there. I'm sure by the weekend you won't be able to get her off your lap.