I totally agree with using analog or digital timers rather than wifi. My wifi likes to "blink" too. Problem is, wifi outlets don't reset until the next cycle, which could be the next day. Digital timers usually have a battery backup and don't lose a beat during power outages. This style is my...
My first thought is to reposition the feeder to an area which well give her some privacy. My 2 yr old female panther is very shy and wouldn't eat from the feeder when mounted near the front of the enclosure. It is now mounted towards the back and she empties it of feeders every time.
Coroplast, also known as Corrugated plastic, can be used. You will need to construct a sturdy frame which you can then attach the Corrugated plastic to using an adhesive such as silicone adhesive.