I would talk to your DD. Is there a smaller version of the horse that she may want instead? I would take her to the store (or set her up with a toy catalog) and get an idea of what she really wants. It sounds like she loves animals...
This is a case where she may be really missing the horse, but she may prefer something else if given the choice. At that age DC received a robotic dog for Christmas and carried it around for almost a year! Good luck