I vaguely remember this movie.
No idea title. 90s movie possibly.
Pregnant teen is sent to live with stepmum and sister (on a ranch or farm)
The sister somehow catches on fire, and the girl runs to her and helps put the fire out and ends up burning her hands (both girls are wearing long white old-fashioned dresses?)
One scene Stepmum has an accident with an axe and step daughter has to drive her to the hospital…..