Thanks for the responses folks. My nerves are still shredded but I really appreciate your thoughts.
I called the emergency vet who said it may be fine, especially as she seems ok in herself tonight, but there can be problems as the bone transits her system... It just depends how well she's chewed them up first. She said I need to watch her closely and watch her poos over next few days, taking her in if there are any problems or signs of bleeding.
I read the back of the pack and tried to find out more on Hollings website or elsewhere on the web but its so bad that there's nothing. OH said they're a commercial product for dogs so she isn't likely to be the first one to eat most of it.
Thanks so much Sasha B you've helped ease my mind a bit, given that your doglets eat them regularly with no problems.
Beau is mooching about as normal now and having a chew of her toys, drinking ok and has done a little bit of training for a couple of treats so nothing untoward there. I think I'll have a restless night though wondering how she,ll be going to the loo tomorrow.
One thing is for sure...NO MORE bones in this house- commercial do treats or not!