Well first, droppings should never squirt out from a bird. Your bird has something goin gon. On the crop, best thing to do is isolate her. feel her crop in the morning before any feeding. It should be mostly empty. If it's not then her crop is slow. Please let us know.
In the mean time, I have some questions to help you have information specifically for this bird:
What is the bird eating - exactly. (Example: laying pellets, some treats, oyster shell free choice). how old is she? When you feel her (and please do) does she feel of a good weight, or does her breast bone (keel bone) stick out a bit too sharp?
Has she ever been wormed? If so with what and when?
I would definitely not do showmanship until you have this correct. Jetting feces is not a healthy bird and will get you disqualified. Plus she's got something going on and you neither want to spread it, nor take her somewhere where she'll be exposed to more germs while her immune system is down.
First things first while you answer the questions above - I would get her some probiotics, living bacteria that help their guts stay healthy and help fix light diarrhea. That could be as easy as plain yogurt, or a livestock probiotic like Probios if you have anyone around raising cattle or calves- they often have some around. Give her some daily.
On her vent feathers do clean up the droppings there as they can attract flies, cause sores, and maggots will hatch in the sores. It's very nasty to have to deal with. So just clean and then put corn-starch on her feathers, like baby powder.
I'll wait for your answers and we can go from there.
What type of bird is she then?