@talkinboutchickens
Can you feel inside to see if you can feel an egg? Very gently in case it's a soft egg. You can insert your finger past the vent. I've gone in about 1.5 to 2 inches which it about to my 2nd index finger joint. Use a big blob of vaseline in the end of your finger to get some vaseline inside. It you can feel the egg try o get some vaseline or KY raound the egg if possibe.
You may also feel some other material, sometimes hardened poop that you can drag out with your finger.
Did you try the warm epsom salt soak? Or if you don't want to do that possibly place her on a heating pad on a moderate setting to help her muscle relax so the egg can pass.