[ Friends ] Open Question : My friend is 15 and scared to sleep alone?

[ Friends ] Open Question : My friend is 15 and scared to sleep alone?

My friend is 15 and has to sleep with someone because she's scared that if
she's sleeping alone, something will happen to her. She's been this way
since her older brother was sent to prison. He's out now but she still
can't sleep on her own. I've tried staying up and texting/calling/skyping
her until she falls asleep in her own bed, and then going to sleep myself,
but this could be until 3 or 4 am sometimes. I've done this for ages but
with me now being a single mother of 2 young children, this is proving
hard, as I'm only getting 2 or 3 hours of sleep before my daughters wake
up and I'm exhausted. I can't be doing this anymore. We've also tried
having her sleep on a mattress in her mothers bedroom for a few months,
and then moving her into her own room after she's slept on the floor for a
few months. She still gets really worked up and afraid. Is there anything
I can suggest to her that may help?