You're pretty green if you actually thought you'd see it back. But now you've created a system in your pharmacy where you have obviously favored her over others (getting her a raise). It's gonna hit the fan and you're gonna look back
This. This is the real problem, and why "lending" (and never lend anything with the expectation of getting it back, consider it gifting), but why "lending" with co-workers is a bad idea. The OP is in a supervisory position over the technician, now in the future, anytime another technician feels slighted by the ops behavior, or by workload, and or by a review, or by the schedule, she is going to see it as favoritism. People will start gossiping about why the favored tech is the favored tech (ie they must be having a sexual relationship.) Other techs will ask for money, and if the OP tells them no, they will view it as favoritism. Complaints about the OP playing favorites will go up the chain. This is a bad situation the OP has started, with no easy way to get out of it.
So...if the answer is no, he either has to a) get the person fired or b) quit the job?
A isn't a good option, because the personal loan was something had nothing to do with the business, if the OP starts harrassing the tech or writing her up or whatever, she is going to complain that the OP is unduly punishing her because of an off-work situation.....and while this isn't sexual harrassment, I can see that just like with a sexual harrassment case, it is the supervisor, the OP, who will be held at fault by his manager/corporation.
In the future, *if* a technician or other co-worker is really in a bad situation (and needing $150 to pay bills really isn't a bad situation, I'll talking about a technician who had had an unforseeable life circumstance that has hampered her financially), talk to the head manager about taking up an anonymous collection for her. One of my managers did this for a technician (who had a specific life situation she was dealing with), people could donate (or not), and then the manager gave the technician all the donations grouped together anonymously--she had no idea who did or didn't donate for her. This is a good way to help someone who needs it, without any repercussions of favoritism (assuming the manager would do the same for anyone else with that type of life situation.)