You could just google your town/city name & free clinic next to it. Even if she doesn't have the means a lot of places are set up to cover the cost. Least here in CA - may be different in other states.
Non profits - planned parenthood are good. You don't need insurance.
If baby is that under the poverty level they can apply for a Medicare card & get treated or if in school the health services are available.
Out of pocket it's just $200 and results come at the latest 5 days.
Getting tested and being responsible is not particularly difficult even if you don't have the means with the amount of advocacy being push for testings these days