CHICKEN APPEARS EGG BOUND BUT CANT FEEL EGG

I have a 19 month old Buff Orpington that has all the signs of being egg bound but i cannot feel an egg in there. We soaked her in warm water twice last night, given her electrolyte inher drinking water and calcium, both oyster shells and crushed tums, applied lubricate to her vent and inside her vent. She is standing almost straight up and it is difficult for her to walk. She is eating and drinking and having regular bowel movements that appear to be normal, not runny or off color. Her comb is darker colored and laying down. What can i do for her? She is currently separated from the rest of the flock inside the house. She normally doesn't care to be handled but last night she wanted to be as close to me as possible. I had noticed earlier in the week she wasn't asking normal, she was sort of tired acting but she was out and about during the day and getting inside to perch at night, i thought maybe she was starting to molt since some of the other hens the same age have been molting lately, but she doesn't appear to have lost any feathers.
Last night when it was time to go in she wouldn't go up the ramp, to the house and when we put her in the house she would get on the perch. She as just leaning on what ever she could. That is what we brought her inside and i thought she as egg bound so I followed directions found online. She perked up after the warm bath, but fell asleep during the second. I have read a lot of posts on here but have not found one that answers my questions. I hope someone can help me out.

Thank you!

Welcome to BYC. She may have an egg up higher than you can feel, but she also could be an internal layer. They can walk upright, be exhausted, and be uncomfortable walking. I would bring her in or pen her up with food and water to watch her closely. Feel of her belly to see if she is swollen or has lost any weight in her breast area. If you have a vet that would see her, that would help.