I have a veiled female she is about 4 month as well. I have a similar problem.
I have her for two months now and not long after we got her, her tongue started to act weird. So her appetite was and still is huge,so at least that part was/is ok. But time after time her tongue got worse: she went for the crickets and her tongue didn't stick out,but the bone part. I saw the purpleish,redish veins. She couldn't catch them of course. She went closer and closer. But at the end of the day there were no crickets so somehow she did catch them.
(+When she was about 2,5 months old, she fell down the brench once while she was asleep.
+ I overdosed her accidently with D+ and multivit.)
Not long ago I read about RI and she had almost all the symptoms. So I took her to the vet this Monday, but unfortunately we don't have any reptile vet around. I told the vet what I think it is and she gave her Baytril. I should give the antibiotic for 3 weeks,but after couple of mailing with Dr Alfonso, I've decided I give her only for 10 days at the very most.
Well I don't want to "be happy too early" but she looks better! The RI symptoms are almost gone and her tongue works. Not perfectly yet, so she is close, but it works.
So will see...
Sorry for the long story but I wanted you to know some history about "our" tongue issue.
Dr Alfonso also told me,that tongue issue can be caused by anything,it is so complicated.
Long story short I have no idea what is wrong with her tongue,but she seems to get better in every way.
Another forum member told me that his cham had the same tongue issue and after a while it was just gone and everything was just fine!
Take her to the vet definitely!
I think at least she eats,so that is good news. Do you see her "puking out"her tongue? 'Cause mine did.
I was and still am worried very much,but I was happy knowing she eats!