My build for Qot is pretty simple. Just place all skill points in bramble/spikes. Leave skill points until you can upgrade them again. Put one in Shamblers (so you can leave them in other lanes for gold).That is her main build. You can decide whether to put the rest of your points into aoe or summons but really it doesnt matter. It is the 2 main skills that do anything.
I would love to be able to make her a true blue summoner but id need a anoter usefull skill to combine with compost. 3 possible skill buffs for shamblers is impracticle without having uproot either gain significantly from ALL shambler boosting skills OR boosting uproot in a fundemental way.
Since she is the worst ranked hero i think some sort of change would be in order. I doubt having uproot heal or sheild towers would make her overpowered and it would be a fitting role for her. Just my thoughts.