There's no way of being 100% sure - especially if she's close to ready for a reduction. But that extra 70 points is quite a long way further for her to drop. Lantus works best at keeping normal numbers in or close to the normal range - often when people shoot a low number, the number won't vary much at all over the whole cycle. It isn't so much about having a particular number where you'd say she's safe to be left, it's about how quickly she's dropping and whether or not she levels out and is around the same number for 2-3 hours. Once you get your +2 test, we'll have a better idea of whether or not it's likely to be an active cycle. Then we can work out when you'll need to test her again. If she's surfing happily by about +4, then she'll probably not go much lower but it's too early to tell that for sure just yet. I'll check back in with you for her +2 test anyway and once you've got that number, it'll be easier to work out when you should test her next.
I remember the nerves at shooting lower numbers only too well! I was terrified the first few times, especially when Rosa was earning reductions quickly - I could almost guarantee for a few weeks that shooting a low number would take her under 50 at that point!! You did really well though and even if she does drop low, you'll be able to get her back up quickly.
