there's a lot going on at puberty that could be contributing to your daughter's weight eating and cholesterol. first off weight gain especially around the middle for girls is normal and to be expected as she is going through the second largest growth spurt of her life. but if she is not being fed well balanced meals at regular intervals excess weight and unhealthy habits can occur. also this is a time when iron deficiency risk increases with the onset of regular periods which can cause low energy. i suggest you visit her doctor and get blood work done including iron levels to check to see if she is deficient. second providing regular balanced meals at the table and involving her in meal preparation should help get her eating on track. regular physical activity is important too. but please avoid dieting and making weight an issue as research shows it backfires. for more on healthy eating during the teen years see this webmd article.
my 14 yr old daughter has high cholesterol but normal triglycerides. also rapid weight gain at puberty stretch mark. her body seems puffed much like someone who is overfed starches. her legs and arms are also hard not fatty at all. as soon as puberty hit she rapidly gained weight and has numerous stretch marks. her energy level is also low.