how do i restrict my horse from eating to much grass?

Grazing muzzle best options if she has to be out in the field for long hours. Use electric tape fencing (doesn't necessarily have to be live) to make her grazing space smaller if she is not out all the time.
 
All of the above, and if you can borrow some sheep...they are great for eating the short fresh grass that's coming through at the moment :)
 
All of the above are good ideas. Mine would be to set up a Paddock Paradise type track so that she moves around a lot more.
 
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