Overthinking

Dont automatically assume ahe's waiting for a bus and would love a ride. She may be waiting for her boyfriend, parents, uber, drug dealer or something else

She or a friend may have have experienced a kidnapping, sexual assault, robbery, or something else one time they accepted a ride from a stranger

She may just not be trusting of strangers who offer rides.

Dont automatically assume it has to do with you when someone turns down a ride