Hi there! Sorry to leave you hanging, I've been away from home for the last little while and missed this! First off: thank you so much for playing! It really warms my heart to hear you've been enjoying this game with your Mom (exactly what I envisioned when we made the game <3 )
It's been a hot minute since I've played through myself so I need a bit of time to play through enough to give you a hint or video walkthrough. From what I recall though, the level is all about power management so it's likely you're either using an extra power somewhere that you need to preserve, or there's a grove hiding somewhere that you haven't found yet (maybe in the south?) Give me a bit of time to grab some footage for you, but in the meantime don't give up! It's definitely beatable and you're so close to the end!
-Tabby