"I just....want to see how I can manage training without Tikki. I'll probably be following behind you anyway since you know the area better. Just don't go too far ahead without me and let me get lost."

Marinette says with a shrug. She got practice enough while transformed for now, she figures at least. But as Marinette she could definitely train. Try to do more and improve her chances of managing as a civilian until she can figure transforming when necessary.