I echo the person who said you should get your beardie to the vet asap. Also, you don't want to use a mesh lid with the UVB bulb; if your UVB is on top it can block up to 50% of your light.
You said you got her a few years ago but think she's probably still a juvenile. If she's a few years old she's definitely an adult. How long had you been using the coil bulb? The strip UVB you just installed, is it new? I apologize if you know this, but UVB lights need to be changed every 6-12 months, depending on the brand. If you've been using a coil bulb for a long time it is definitely possible that she has MBD, and insufficient care while you were gone may have caused new problems or exacerbated ones that weren't so obvious before.
Was your caretaker giving her calcium and vitamin supplements while you were gone? Also, no offense to whomever was the caretaker, but if your beardie was skinny and lethargic when you got home their assessment that she was "alert and normal" is definitely drawn into question (I understand not everyone is familiar with reptiles and it's not easy to get experienced caretakers).
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