Want to know. It vitamin d definitely.

My daughter's age is 14...she has a very low immunity...because of this she have runny nose ,sneezing,cold cough all thr year...and i noticed in lockdown that she felt some cracking sound in her joints...is it normal or a sign of calcium deficiency...she eat milk,eggs carrot, lemon,amla,chana,but cracking sound is not getting over...what to do...in 7 months lockdown she didnot go a single day outside..is it vitamin d definitely...or how i know what is the root cause of the problem..thanks...please don't suggest any physical or online consultation...gave me a idea and some tips...she also was very streesed because of that nurvous system became drying...because of this dryness..her vocal cord became dry..eyes nurve became dry some...please help me please ...