The antibiotic will only suppress her natural ability to overcome this assault by the tick. It may 'come back out' once the antibiotic is finished, and then again, it may not - in which case, the whole matter becomes a little more complex/sticky to treat.

Someone needs to take the case properly before prescribing anything. It's hard to tell if the ledum was resolving things or not, because antibiotics were thrown into the mix.

If she hadn't had the antibiotics, then you could have observed to see if the situation would have resolved quicker [after giving the ledum]. But now the picture/case is clouded by the antibiotics. So, now you need to wait and see what symptoms arise - that CLEARLY indicate a remedy.

Then report what's going on to a homeopath - and let him/her assess what's needed.

Don't underestimate how suppressive antibiotics can be. It varies with each person, of course - but it does happen.

Just observed a case of a little girl with impetigo.
-She was given oral antibiotics. The impetigo cleared up.
-2.5 weeks later - the impetigo started to come back out (once the course of antibiotics were finished).
-The parents wanted to treat her homeopathically (since it's obvious the antibiotics did absolutely nothing to cure it).
-She then was prescribed a dose of Sulphur 30c- because the symptoms indicated it.
-Then we were waiting to see what symptoms would clearly point to another remedy (if any) and her father (we later found out) was continuing to put antibiotic cream on the spots (thinking it was going to keep it from being contagious to others)!!
-Now she's a mess. Having all sorts of headaches, general malaise, aches and pains in her hypochondria, stomach pains and a few other symptoms. She's been given another dose of Sulphur (200c this time) and now we're waiting to see what happens.

Good luck! I hope you're able to get some sound help. And, I wish your mother the best.