It's a tricky one, and one I'm now learning to navigate as a trainee coach. Without good basic edges, everything else is that much more difficult. I set my skater a challenge last lesson - complete circles on her forward edges. She's realised it's a lot harder than she thought!
My coach (and mentor) always says skating is like building a house. It takes time, and you have to have a solid foundation. If your foundation is weak, your house (and in this sport, you!) will fall down.
When I talk about trying more advanced elements, his tactic is, "Yep, that's something that's down the road. But to get there, we need xyz first, so let's look at that." So it's not a no, but a not quite yet, and that works for me, I don't get disheartened.