My sister (17)has, headache, tonsils, breath problem, peptic ulcer (8yrs)heavy period, chest pain, etc. Are these problems are natural? What we will do now?

These are not normal. Those are a lot problems for a young girl. All these symptoms sound as if they could be related to obesity, so if she is overweight that may be the underlying problems. I would recommend that she see a primary care physician to start and go for there.