That's part of the problem with stalling, is that they sometimes go down while they're not eating and you're waiting for the BGs to go up. Normally, if you had given the shot, she would have eaten her food and that would offset this drop in numbers and she would maybe have had a nice even day of BGs today (what we in the Lantus TR Forum refer to as surfing). You're welcome to open a post over there in the Lantus TR Forum any time you're ready. There are lots of people there almost all day and night to help you, guide you, and encourage you.
There are many different ways to feed, but I tend to feed 1/3 of J.D.'s morning meal at shot time, 1/3 at about +2 (two hours after the shot) and the last 1/3 around +4 (four hours after the shot). He will sometimes get a snack at +6.
It's the same thing at night. I feed 1/3 his nighttime meal at shot time, 1/3 at about +2, and 1/3 at about +4, and then sometimes a small snack around +6. The feeding early after the shot is to offset the effects of the insulin to get a more even level of BGs throughout the day. By the end of the cycle, they really don't need any more boost from the food to get their levels up, as the insulin is starting to wear off at about +6 or so, with Lantus.
And, mainly, you don't want to feed from 2 hours before shot time until shot time, so the food boost doesn't interfere with the Pre Shot test and you'll know whether she is going up naturally on her own, or staying the same, or going down.
Since you don't have that much data yet, skip this shot.
Let me know if you have any questions, I'll be around most of today, off and on, and tomorrow. I do encourage you to post over in the Lantus forum though, so you can get other ideas from all the people who know Lantus best.