Your finger won’t hurt her. Just think about how big a Egg is compared to your finger. She’ll probably not even notice. Hold her till she’s calm (and you’re calm). It’s a quick little exam.
How’s her crop? What does it feel like. Her crop should be empty first thing on the morning. Does her breath smell?
What about her vent? What does her vent look like?
You need to figure out what’s going on with her by process of elimination. Bring her in and crate her so you can monitor her food and water. Pictures of her poop will be helpful. Check her for injuries top to bottom right down to the skin. Look for parasites. Could she possibly be egg bound...