I agree with Greatwtehunter, try giving chopped up pieces. Try cutting the worm into 4 equal sized pieces and let her eat the head part first. and then the next day, give her the 2nd pieces. 3rd day the 3rd piece, and 4th day, the last piece. and then start out with a new worm after the 4th day.
If you cut a worm up into four small pieces, will it neccessarily last 4 days (and still be alive and wiggling)? I've never tried, just surprised, as I was under the impression that if you cut up a worm into small bits, it will not keep that well?
But yes, I would try offering small portions of tempting, wiggling, live food - but most importantly, try to establish what is causing your axie's loss of appetite. As mentioned above, a check of ammonia, nitrite, nitrate and PH levels would be good, additionally, check the water's temperature and your filter flow, ie, is it causing stress?
As the problem only seems to have occurred within the past month, is there a new element that has been introduced to the the tank - new hides, plants, sand, filter etc?
Or a change of location, diet, dechlorinator?
Zoe x