It's OK to feed her.... Just no food 2 hours prior to the preshot test. How many units is her shot? You may want to post for dosing advice on the lantus forum.... They will tell you to set up a signature and spreadsheet to help you determine the best dose.Yes home testing,low to mid 200' s at times,i feed her right before her lantus shot in am,lantus usually peeks 6-8 hrs,so when the 6 hrs is coming up if she is out of fancy feast classics,ill give her maybe half a can or so ,or should i not feed her extra