Hi! While screen time is especially detrimental to children 1-2 years of age and not recommended, do not feel guilty about offering screen to your baby for short periods of time.
Also, at this age toddlers develop something called as physiological anorexia, that is, more physical activity and less appetite. Which is normal.
That being said your baby does weigh less than 3rd centile for her age. What was her birth weight? Are there any other associated health conditions? What is the regular food that you offer her?
Next Steps
look into reasons for baby not gaining weight at the normal rate for her age