injunction against moving out of county

My daughter's ex has had her served with papers petitioning for custody (she was granted full legal and physical custody four years ago). She is now off work on a medical leave for depression issues and he claims she is unable to care for my grandchild. The main gist of the papers however point to gaining an injunction against her preventing her from moving my grandson out of the county where she now lives. She is currently dating someone who lives about an hour and a half from where she lives and he is concerned she'll marry and move there. An hour and a half away! He claims it will be a hardship for him to carry on his visitation rights. It's not HER fault that his car was repossessed for non payment of bills, his wages attached, he's in the process of bankruptcy ... Does he stand any chance on this? I'm sure the state makes a difference - it's Pennsylvania. Can this be done? It seems like she's legally being held hostage. If she had a better job opportunity outside her area, would she have to turn it down because of this injunction? It seems not to make any sense to me. Can anyone help? His court papers, incidentally, state: "There is a pending custody order from the Family Court, etc." Why is the term 'pending' used? To me it implies something not yet acted on. Any help? Thanks for any help you can give on the subject.

my sister has had the same done to her and she fought is by showing the court that the move was good for her and the children. a chance to move on and better living enviroment. plus her ex was real bad on not seeing the children and she kept a record of every visit day he missed. even though for some reason he lived 5 miles away and drove past ther to go home. when so did move however the judge said for them to find a public place to meet a t in the middle.
hope tinghs work out.