I’m sorry for all the agony you’ve been going through. Do you feel like police are doing enough to find your daughter when she decides to go? Sometimes police don’t search for runaways, but they should since she’s 14. I share your concerns about her possibly getting pregnant.
If she leaves again try calling any of the local youth shelters? It sounds like she’s either staying with friends or on the street. Are there any boyfriends or previous boyfriends she might be staying with? Maybe try to track down the parents of these other kids she associates with. Her friends probably aren’t going to divulge any information. Post her photo at the local food banks and soup kitchens if she flees again.