I baked a pie shell for a lemon pie but was unable to finish the task, can I freeze the pie shell now that it is baked?

Yes, you can freeze it but cover it with parchment paper and zip lock it to avoid the freezer smell

Yes, you can freeze a baked pie crust. Freeze it and then put it in a ziplock bag for a maximum of 1 month, so you don't run the risk of freezer burn.
I thaw it (out of the bag) and put it on a very low setting in the oven for a few minutes to make sure it doesn't get soggy. Use it with a filling that doesn't need baking.

Yes it will