Glad to hear she perked back up. It is important to figure out the cause of her periodic issues.
I agree it sounds like it could have been gas, but the pain from gas can lead to stasis (and stasis can cause gas!).
Stasis can progress very rapidly. I would say if things don’t improve within an hour… or even 20 minutes…. to get her to the vet. A rabbit that hasn’t eaten or pooped in 6-12 hours is considered to be in a state of emergency.
It’s good you have simithicone on hand, you should also have critical care in case she won’t eat and you can’t get her seen immediately. Some don’t recommend force feeding until seen by a vet, in case there is a blockage, so you should discuss this with your vet.
Concerning water: do you provide a bowl and a bottle? Do you also serve veggies dripping wet? does your tap water taste good?
What type of hay do you feed? Sometimes offering a variety can boost hay consumption. You might try oat hay, or just a different supplier. Also stuff hay in toys to make it more interesting.
Also, dental issues can lead to stasis and gas! And not eating enough hay can contribute. So, when you take her in, you should request a deep oral exam to look for possible culprits.
More frequent grooming should help with the fur issues.
Sorry this is kind of stream of consciousness!
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.