You do realize they are likely to stretch at least double the size they were when you switched, right? Since you are in flower, your choices are more limited.

Here's a couple choices from best choice to worst:
Find a taller tent or closet.
Revert back to growth stage and top that lady. Extreme, but doable. Heals in a couple of weeks, after which you can revert back to flower. During this process you can take clones.
Provide more side lighting than overhead lighting.
Top her now, and hope for the best.