I imagine that when stalling, after checking 30 minutes later if the number is not rising, I can give her .5 dose?
It depends. If the number is still falling, you may want to stall some more, no food, check again in 20-30 minutes. If the number is still falling at that point, it's usually better to skip the shot that cycle until you get more comfortable shooting those low numbers.
Getting more comfortable means, doing a bit more data gathering when your schedule and life permit you to test mid-cycle. For many people, that's not usually possible except for days off like the weekend.
If the number is rising, I think you would be just fine to go ahead and give the shot. That could be either the full shot, or a token dose to keep the Lantus insulin depot topped off.
Today, you got a 176 at AMPS and went ahead and gave the 1U dose. That looks like a good decision to me. It will be interesting to see what Martha's PMPS is this evening.
Would you be able to add a regular "one last test before you go to bed test" to your routine? I think this would help to give us some good data as to what is going on with Martha.
Also, would you please add the meter you use for testing to your signature?