Home made beet gnocchi is sticky
The beets probably contributed more liquid than planned. I would try blending them, then straining them through a chinois (use the back of a spoon to push out even more liquid after you allow gravity and a pinch of salt to do its work), and then blending the rest of the ingredients together using your hand-operated food processor. 

Adding more flour at this point is just going to expand an already engorged gluten network resulting in really chewy gnocchi, so I wouldn't do that. I don't think there's a great way of saving the batch you had. 

So, dis-engorge the beetroot prior to starting by cutting it into slices, lightly salting it, processing it, then straining it, and you should find your instincts to add more flour have diminished the next time you try it.