Hi I am 27 years old girl and my height "5.2". Plz tell me what is the ideal weight for me.?

Check it out. Use a BMI calculator to know. SEE: https://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmicalc.htm. BMI Categories:
Underweight = <18.5 * Normal weight = 18.5–24.9 * Overweight = 25–29.9 * Obesity = BMI of 30 or greater
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Varies. It varies but a starting point would be a body mass index of 25, which would be about 136 lbs.