Considering the age and overall shape I would not worry for a second that's the good news the bad is that it could last a lot longer and I know it can be frustrating and worrisome.
Now the thing to keep in mind are
She is an adult not an hatchling.
The are very efficient as far as their metabolism go and need a lot less food as they grow.
They are often overfed in captivity.
Other points I want to make I do not weigh my animals either (if if I do if for pic reference of a specific mutation and how it progresses or for a customer)
So I recommend weighing an animal? Young one when they have issues yes, older ones not really the overall body condition tells me more about an animal than a number does.
Now what can you do? Change everything, if your temps are at 90 lower them to 86 if they are at 86 raise them, change the substrate type etc, sometime with adults change is good, that is of course if your husbandry is optimal to start with.
Something else you can do is take your snake on a car trip, does not have to be long 1 hour round trip is often enough (make sure the snake is secured in a pillow case) it sounds silly but it's an old trick that actually works I have done it a few times with animals I could not trigger back into eating by changing husbandry.
And most important be patient leave her alone we all have been there.
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