If it's only been a month I wouldn't worry too much about it. As long as your husbandry is correct & the snake isn't showing signs of sickness. It's not abnormal for them to go off feed. I have a female mojave that was the biggest piggy I have ever had, then 3 months ago she just stopped. I offered her weekly & she would refuse every week. Tried day, night everything.. She actually gained 20grams which I thought was odd, water probably?

Anyways yesterday I offered her food & she took it. Story being is as long as she is not sickly, loosing weight & husbandry is correct I wouldn't worry too much. I read somewhere that someone had one go like 8months without food & was perfectly fine.

I would do as the others suggested, give us more info on your husbandry, pictures etc, to rule out something not being correct.