Yes, but they were very close to her house. If they were driving, and he told her to take off her clothes, she wouldn't have folded them neatly.
Either they were close to her home when she took her clothes off, then drove off and tossed the bag or, the perp came back after the fact and got rid of the bag.
If it only rained Friday, then LE would know that if the clothes were wet, that the perp drop them that day. If they were dry, then on Saturday or Sunday.
I am sure LE or FBI have pinged her phone to know exactly when it stopped moving. So that might corroborate the info on when the bag may have been dropped.