A) A phrase that seems to simply state the obvious but actually implies helplessness. B) A phrase that seems to simply state the obvious but actually means it will be what it is, as in it ain't gonna change, so deal with it or don't.. See also tough shit, oh well, cry me a river and tfb.
Find and run to your nearest escape route, whether it's behind a fence, a tree (one she cannot knock down), a large bale, a tractor or truck, anything that is large enough that will protect you and act as a barrier between you and that cow.
In order to feed your cows, you need a meadow to cut the grass and produce hay bales. Cut the grass using a mower, then either load it with a loader wagon and sell it to the Biogas Plant, or continue with the steps needed to make hay bales for your animals.