My ex wife gave me custody of my 2 kids does she have the right to take them from me

First of all, you might not have had to pay child support seeing as you each had custody of a child, but that is no longer an issue. Second...you need to go down to the courthouse and file a motion for full legal custody with primary residence. Let them know that your ex dropped her off 7 months ago. You can file the motions and represent yourself if money is an issue. I personally would want the advice and guidence of an attorney, especially when the welfare of my children are at stake. If you want to retain a lawyer...it would probably be in your best interest because they could take care of all the leg work and filing of paper work. The attorney would file the motions for you. I highly doubt they would allow her to take the child back and the attorney can advise you more on that matter. If you do nothing and she comes back and takes your daughter, you will definitly not have a leg to stand on because legally she still has custody.