It could be iodine deficiency (pretty rare) or milk goiter (fairly common) or bottle jaw from severe enemia...if her eyelids are pale (lt. gray or white) then I'd say bottle jaw and deworm her w/ a GOOD dewormer asap.
It could even be CL but not real common at such a young age.
Keep an eye on it...IF it is CL, you do NOT want the abscess to burst on it's own. If you can a vet to lance it and send the exudate off and test for CL. Yes the goat is young, but it isn't impossible to have it.