I'm mostly replying to bump. But my inclination is to say, relax. Probably nobody knows exactly how she will react, how quickly she will get back to her normal self, but guaranteed she will not be scarred and, in all likelihood, she will adjust before your trip is over and, after a few days, return to her normal self when you return.
My only relevant experience is with children at a very different age. My 16 month old did have jetlag when we flew to Europe, and it was quite a difficult first night, for DH and I to deal with her and have patience when we were so tired and confused ourselves. In subsequent cross-ocean travel, neither my 20 month old nor my 5 week old had jet lag or seemed confused with time.
Advice and commentary on living overseas
DD1 15, DD2 12, and DS 9