PLEASE Help: BN still alive but for how long? Bloat/parasites/gravid.

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First off, I'm new and screwed up two posts relating to her and this issue. I apologise immensely! 

Ok SO my female BN has gotten increasingly bigger & did a WHITE POOP yesterday. She has never released eggs before and has a 0 protein diet.

She DOESN'T like any veggies-zucchini, cucumber, peas, beans, carrot, lettuce, potato ect.. I've tried peas again just incase it is bloat, but she won't eat them. Generally speaking she just prefers to eat the DW and algae off of the tank. She hasn't eaten any food left over from the other fish because this happened the day I got them. 

I'm panicking because I don't know what to do and if I can prevent her from dying somehow, I want to.. I don't want to watch her die. But I'm not sure what's going on and haven't had much help  

My male BN had poop that was a mix of white & brown so I'm assuming hers ok. He had eaten zucchini last night. 
Any help would be much appreciated! 
Quarantine Tank: 35 Litres, 
Ammonia, Nitrite are 0.00, Nitrates are fine and within range (aquarium tested it)
pH is 7
Temp 26.
Substrate: Sand/Gravel-I will complete vacuum once every few days to ensure it's stays 100%
General-Few plants, cave, large piece of driftwood.
Filters- 1x sponge (with air pump) and 1x normal for flow

Original Tank:
Fish- 2x Britslenose (pair), 4x Platy
Tank Measurements: 
2x14x18 (whatever that means)
Ammonia, Nitrite are 0.00
pH is 7
Temp 26.
Substrate: Sand -i do vacuum it ever week.
General-Lots of plants, rocks, driftwood.
Filters- 2x sponge (with air pump) and 1x normal for flow.

It is very odd that a bristlenose doesnt like veges. I suspect she is just getting enough food from elsewhere that she doesnt need the veges. They will eat slime and algae over anything else so if there is plenty of that in the tank they they will be happy.

Might pay to give her an epsom salt bath

When ever i had to do it , it was 2 Table spoons of epsom salts to 5 lires of tank water for 20 minutes

Should help her pass the bloat

Thank you very very much for your reply Doug! Yeah, she does eat algae off of the tank  Her favourite sitting spot is where the sun hits the tank for a few hours every day  

Where do I get the salt from? 
Do you think she should be alright if I do the salt bath? 
Will I need to remove the plants in the tank? 

She has done another poop last night. It was incredibly long and the boldge (can't spell sorry) around her vent area has gone down a little bit. It's still yellow though. I've attached some photos I took of her last night. One as a head shot (her finn is down so she looks funny), one of her stomach and another of her doing a poop (but it doesn't look white in the photo -.-). Thank you very much for your help again, it's really appreciated. xx

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