My daughter tested positive for mono yesterday. How long has it been since she contracted the virus. She doesnt seem to b overly tired but had the sore throat and swollen glands.

Mono testing. Given that she has other symptoms, it is likely that the disease contact was within the past week to 10 days. The mono test is based on development of IgM antibodies, which are the first ones to appear, and develop within about a week. Depending on the test, there can be other considerations, but her case sounds consistent with the common scenario.
Mono. The time between contact and symptoms is 4-8 weeks. I hope this helps and that she feels better soon. All the best.
Mono. There is no way to tell from a monospot how long ago she contacted the virus.