Review the item:
Michelle is terrified of spiders, so when she found one in the bathroom,
she panicked, refusing to shower for three days to
use the restroom, she drove to her neighborhood gas station.
A comma splice occurs when two complete sentences are incorrectly joined with just a comma. In the example above, no such comma exists. She panicked, refusing to shower for three days is one sentence. To use the restroom, she drove to her neighborhood gas station is the second sentence.
Because only empty space exists between the two, you should call this error a fused sentence.
To fix the problem above, you could put a period after days and begin to with a capital T.