If you have some way to restrain this heifer-
( pinned against a real sturdy fence or wall) and you have some stout helpers, you can get someone to lift her tail in a straight line up over her back and bent hard along her spine towards her head, and that often paralyzes the hind end. The draw back to that is if they can wiggle that tail slightly sideways instead of completely straight in line with the spine, they can kick.
There are several different styles of "cow kickers" on the market for milk cows, and they will paralyze most cows, but I have seen some cows still able to kick with them on, or able to knock them off and kick.
I had to lance a huge boil on our milk cow's hock and no one available to help, and I tied a rope real tight around the belly just in front of the udder and managed to lance the boil open before the cow freaked out. The draw back to that method is sometimes it paralyzes them too much and they can fall down on top of you.
You really need some sort of a squeeze or alley way or stanchion to hold your heifer in.
Some people actually make their own wooden stantion out of very heavy lumber.
The advantage to having some sort of squeeze system whether homemade or metal is that it probably will be used again and again at some time in the future.Buying a squeeze new is usually pretty pricey, maybe check out someone who has gotten out of cows, it is surprising what you will find sitting around in old farmyards..