We have two dosing methods here, the one you follow determines how you intervene and with what food. Since you aren't technically following either or testing much, I'll assume the conservative one.
First - aim to keep her in the 90s range. 50s are still safe you just don't want to go much lower. We usually do 1-2 tsp food at a time, you want to keep them hungry if they continue to drop later. Below 40 is HC and karo/honey, 40-49 is usually just wet HC, 50s generally MC, 60s and above we try not to intervene too much, but LC is fine. Without a lot of data/knowing how her cycles go, HC is ok this early (I'd have just started with 2vtsp and no kibble)
Depending how the cycle plays out, you may need skip or do token dose tonight. Regardless, you need to reduce your dose by 0.25U minimum.
Have there been any food changes recently?
Please do start getting at least 4 tests per day - each preshot value (should be fasting for 2 hrs prior), and then at least one midcycle test for each cycle.