went in Jan once with 6yr old grandaughter, evrything great, not crowded so no big queues for rides, booked all with Virgin, didnt need a car., weather sunny but not too hot. You will be limited as to which rides permit a 4yr old to go on, usually depends on height.
Go soon and have a great time, though you will probably have to take her again in a few years time.
Disagree with comments about Disney Paris, yes its easy to get to by Eurostar , but if its cold and rainy [ been 4 times with grandkids and 3 times it was raining] its miserable, you just dont get the atmosphere there that you do in Florida, if you havent "done" Florida you will think its okay, but once having been to Disney in Florida or Anaheim you will realise that there is no comparison.