Hi, Lynn, Elizabeth Potter Frampton did have half sisters by her Father, Thomas Potter's first marriage to Anne unknown.
There was some confusion over whether Mary Potter was also a Mercy Potter, but some legal reference to her as Mary Mercy Potter-----after she was married might have cleared that up. Besides, other references only mentioned Thomas Potter having two children by his first wife, Anne.
I am still looking for the Opdyk relatives, in laws of William Critchfield The search is half the fun. LD