I am also a female (5'6") and I did nearly all of the demo on a recent bathroom remodel myself. I did have some assistance from my brother and father carrying the vanity out of the room, smashing the cast iron tub, and taking down a large mirror. If you are in reasonable health and shape, you should be able to do this yourself with the exception of some awkward or heavy lifting that might require two people. My bathroom previously had a cast iron tub, full glass shower doors, tile over a mortar bed, and sheet vinyl flooring. I removed everything except most of the dry wall.

The hardest part was actually hauling the tile and mortar bed waste down a flight of stairs and outside. So make certain you're comfortable carrying heavy loads of materials to your dumpster. You may be surprised at how much material you'll be dealing with. Get proper tools and equipment including gloves and eye protection. (Flying tile shrapnel is sharp.) Also, demolition by myself ended up taking longer than I expected, so be prepared for that. I'm glad to hear of other women that are taking on home improvement projects themselves.