She keeps on barking all day   

Not sure if I can post a link on here but a site with just the information you need is: www.perfectpaws.com/bark.html

I hope that helps.

Have you looked into the obedience collars, get the one with the remote, that allows you to first give a warning beep, if she is barking at stupid stuff, YOu'll only have to zap her onece or twice, after that the beep will be enough, and then you probably wont have to use it at all, we used one to stop our dog from digging, and jumping up on people. It works

I am thinking that the Welsh Corgie was originally bred as a livestock dog? I know they can be very protective of their people... maybe she is trying to herd you when you walk away from her? if she is penned or chained outside does she bark at the leaves blowing about?

Barking is natural for an energetoc dog but it tend to get out of control because it gets your attention which makes it worse. You need to reward her when she is quite in a setting she would normally bark, or just at random times (praise treats etc) and ignre her when she barks. if that is not enough a squirt of water can be a deterant.