Well... it was best she tried. Maybe they weren't really as short as they seemed. Or they could elongate when she got a hold of them? Going with the optimistic Hufflepuff view, Alice grabbed a vine and pointed at it as enthusiastically as she could. "Vinea Funkiless!"

... no results? Was that the wrong movement or spell or something?

Racking her brain for a while, the proper incantation finally occurred to her. Merlin, this memory loss was the worst. "Vinea Funiculus!" Point.

This time, the vine in her hand began thickening and twisting, growing coarser and stronger until it was a tough rope. Alice gave it a sharp tug to see if it'd hold, ignoring the searing pain in her elbow in which the movement resulted. Only once she was sure it could hold her did she let her feet lift off the edge of the ravine and wrap around the rope instead, just as her arms were.

And the Acromantula was still coming closer. Not that she was scared, because she wasn't.

But it'd be cool if she could be on actual ground rather than dangling off a vine!rope, yeah? Yeah. Working on that.