There is a woman's shelter in Denton. I couldn't find the number for it, but you might try calling Woman to Woman Pregnancy in Denton ###-###-####) & they might be able to lead you in the right direction.
You might also try the food pantry at the Lake Cities United Methodist Church in Lake Dallas...they may have information on where she can go. The main # for the church is ###-###-####. I believe the pantry itself is only open on Tues & Thurs.
Also, if she hasn't already, she should contact a counselor at her children's school to see if they have any resources there.
Texas Workforce in Denton: ###-###-####. I don't know if they'd be any help, but you never know.
Hopefully, something will turn up...