Yes-ish, the seatpost is the determiner of what will work. When I trimmed a 24" road bike down to a 20" to fit my then 7yo I had to try 3 different posts to see which would allow the seat to sit flat or with the slightest tilt of the nose. As you can see in a pic someone posted above, its easy to do with a seat pillar and clamp. In my case I have/had a small drawer of 27.2 posts and didn't want to spend more money on a pillar and heavy steel clamp. Of the 3 only one worked. Profile also makes a pedal forward post that's designed to tilt forward, while thomson's setback post can also be turned forward for the same purpose. These last two wouldn't work for the OP as they both require a more post to be exposed then she has in her pic.