Thanks for your help. Water going into refrigerator works without problem. I was able to disconnect line and run water into small bucket using valve on supply line.
My research found some GE Profile side-by-sides that had water line freezing problem and that there is a warming kit to prevent that, but I did not find that this is a problem with french door model. I turned off circuit breaker to refrigerator. How long would it take to thaw line in 70 degree house?
I'm wondering if I damaged the housing where filter attaches. It seems like housing is tight, but there was not much room to remove filter between top shelf and filter. It's possible that I damaged housing getting filter off and on. How hard is that to replace?
Further research found this part is called Water Filer Head and has part no.
WR17X12469. Have not found replacement instructions, but part includes tubing that goes down back of fridge.