I just got a 5 yr old mare that is susposed to be due to foal in about 3 weeks. They said she hasnt ever had any shots/vacc. and she hasnt been wormed since last year!! She has diahrrea and Im not sure if its from worms or all the fresh grass she is getting here. Should I worm her now??? Would it be safe?? What would you do for her??? Any suggestions will be greatly appreciated!!!!!!!!!!!!!!!