I would not administer the Zantac. For one thing it is totally out of date and also giving a medication with prokinetic properties (gut motility increasing properties) is contraindicated should the Rabbit have a GI tract obstruction.
I would get your Rabbit to a Vet ASAP, especially if she has not passed any poo for several hours. What comes out is as important as what the Rabbit is eating.
In the meantime make sure that she is warm ,hypothermia can set in quickly when a Rabbit is unwell.
Try to encourage her to drink
This link may be useful to read:
http://anyflip.com/dvpt/hzvv
I hope you manage to locate a Vet and that your Rabbit will soon be feeling a lot better.
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