>thought it might be seperation issues but she does her own thing when i'm in. she will go and lie in a diffrent room no problems she doesn't follow me around the house.
In this case though she knows you are at home. You make no leaving signals so she has nothing to get anxious about and she knows that you are only in another room.
I'd echo what someone else has said - start all over again with getting her used to you leaving. Look at your leaving signals; coat, handbag, perfume, keys etc; close windows and doors, last wee, then off to the crate. If you only ever do this when you leave for 2 hours your girls anxiety will rocket from the minute you make moves to leave, and continue til you get back.
Take it one small step at a time, start by putting her in the place you wish her to stay and go upstairs, or out one door and in the other. Take it very slowly and do not say goodbye, or greet her when you get back. If you gradually get her used to being left in these circumstances you can start to add in your other cues. There is some good advice around if you want to do some further reading - perhaps someone else on here knows a site to start you off. Just be aware that it will take time and if you have to leave her before you/she is ready then you'll just be back to square one and undo all the good work
Do not use a bark collar as these are only to be used if you are with the dog.
They must not be used without supervision. Dogs left to their own devices will probably just learn to bark on through it and also your other dog will set it off too.
Finally, if this is a new behaviour, has something changed recently. Trying to restore things to their previous state might speed the process up a little. If she is noise sensitive, and barking at possible intruders, do make sure there are other sounds in the house to distract her. A radio might help :)