Thunderphobia

I have a 5 year old German shepherd Stella who is on the anxious side.  I’ve tried essential oils and drops to try to help her.  She’s had a heart murmur since birth so I’m always afraid the stress will negatively impact her.  

A thunderstorm approaching, sends Stella into high anxiety.
After giving her Ewegurt, Stella showed no signs of anxiety after 30 minutes even though there was thunder and lightling.  In fact, instead of her hiding, she was actually looking out the window!  

Thank you!  Cathi O.