Johnandsue, it certainly wouldn't hurt to try, I take it the doctor has no objections? I don't know that just "better results" are to be expected, but it would certainly have some effect.
My experience with Lantus was that it would kick in within about 2 hours, but often not last 24 hours, more like 20. I took it at 10 pm, so the result was that my evenings things could really run away. I was going to try taking it every 12 hours like mfg52 above montions, but I've moved to a pump since.
It sounds that if she took it at night it may be in a position to really be working during the night (which is oh-so-important!) and then well into the day. Sounds like a good plan. If it is currently running short of the 24 hours, that leaves things erratic in the morning which is not good. Evening is easier to cope with and diagnose.
As for Lantus vs other long acting, I thought it was of huge benefit to me, providing unequalled control overnight, and great "floating" support between meals. But then I am me (and I am type 1 as well). Give it a good go but if it doesn't work out - move on.