I don't want to overpower her, I just remember seeing Sasuke make flames and I thought it wasn't fair if water users couldn't do the same as well. I'd say her own jutsu would happen in stages if we wanted use of no water, plus ice, it would probably take her a couple years to get to the end result. I'd say if she creates water, then is able to freeze a small portion, that would take some serious control and mastery. She'd need to start with being next/in water to create the orb and then it would take considerable training before she could use her chakra to say, pull in moisture from the air and then adjust that.