What's your day like? Can you wait another hour, test and if she's above 200, then shoot? Doing that would mean your schedule will be off, so your next shot after that one would need to be 12 hours later.
You can also skip. It's not the end of the world. Her next number will probably be high as she will have been 24 hours since the last shot. You can get her back on track. For the pm shot, you might give the one unit. And monitor.
So next time, wait 20 minutes with no food and retest. If, for example, she was up to 250, you could have shot a little less than the one unit.
Don't worry. You'll get the hang of this. it's complicated and a steep learning curve at first.