My Daughter Is 20 Years Old And We Are Concerned

My daughter is 20 years old and we are concerned about some things. In less then a years time she has gained 60 lbs more so recently. She is very careful about what she eats. She works as a pharmacy tech so she is on her feet for anywhere between 6-10 hrs a day.
She will find random bruises. Irregular cycle. She used to be 26 days now is varies from 29-36 days. She does have some muscle fatigue but that may be because she is on her feet so much. She has also been some what more emotional and having some periods of anxiety.