Unsure what's wrong with Speckeldy

One of my Speckeldy's has been doing water poo's for a couple of weeks. At first I thought it was worms so I used Flubenvet for a week during which she stopped laying. It's now been 5 days since she laid and I'm getting quite worried. Her comb is reddish and she appears to be eating although she does seem thinner than my other two.

Does anyone have any ideas or should I just take her to the vets?

Regards
Marc

I have the same problem and also would like to hear what to do. I was given four game chicks, about a month old that stank to high heaven. One died the first night, and of the other three two still have dirty bottoms a month on. The vent itself looks clear but the feathers around it are always wet, although the horrible smell has gone.
The birds, apart from this, seem perfectly healthy. they had few feathers at first but have grown them well over all the bald patches, and their behaviour, apart from the littlest one, is normal. Littlest one does a little squawking when it tries to poo and often does nothing. There is no blood or signs of worm in the faeces, which is mostly normal.
hopeing for suggestions.