Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner. If you would still like assistance, can you tell me:
Was it just marrow or any bone?
Any retching, gagging, lip licking, or vomiting?
Is she drinking? Can she keep water down?
Are her gums nice and pink (not white/pale)? Moist or sticky?
Any breathing changes or swelling in her mouth?
If you press on her belly, does she have any tensing, tenderness, discomfort, or pain?