Originally Posted by Iride01

Step throughs will generally be heavy. If it's expected that the current bike will still be used after recovery, then isn't just leaning the bike way over towards her to put the saddle low enough and then pulling the bike more upright after straddling it a viable option?

Though I know you said she didn't want an upright geometry, most step throughs I've seen are more of a cruiser style upright geometry and there really shouldn't be any issue with that for somewhat short leisurely riding during recovery.

And if her current frame has a lot of seat post exposed, then take a look at dropper posts and see if that might be an option to use with the current bike.