Vomit problem. (it is cost effective).

Doctor My daughter is 4months, she is not breastfeed from her first day..hence pediatrician recommended saras dairy blue milk packet and she was having it without any problems. I am currently in small village of Rajasthan and here after lockdown in March dairy milk was not available and powder milk is also not present nearby shops hence cow milk started for her...she is digesting that also but from last month she is doing vommiting after 15-20 minutes of  intake of milk...vomit is watery having milk solid particles like curd...i tried Aristozyme also...but no effect. Is this normal in kids?What should i do now... should i change her milk to powder milk(it is cost effective). Her motions are normal two times a day. Please guide me what should i do. Ankita Sharma(Mother)