You can add a little more dirt to cover the long stem it won't hurt it, plus increasing the light intensity a little should slow that stretch ๐ช๐ป she looks happy ๐ฑ
Sometimes it bothers me a little when people give me unsolicited advice ๐ if you are like me then don't read the rest of this ๐
Instead of using the cardboard rolls it's okay to add soil to them covering the stem, roots will actually come out of the covered part of the stem and make it stronger ๐ช ๐
Good luck ๐