Is it the 4-wheeled Jeep model (not the jogging type)?? If so I think it should fit it just fine. If you have a Babies R Us near you they have carried the Jeep stroller in the past and they are very accomodating so I think they would let you try it on in the store - or if they don't have your stroller in stock they might let you just bring your own in to try it and make sure it fit.
And thank you - she is my world.