The best mod for that is
anysizeher. It has an option to automatically bend their knees if she's too small. An older version for it couldn't change the size of her head but that has also been a feature for a while now. It still acts a little wonky when making her scale close to and below 0.7 tho. A word of warning, many animtools positions won't work correctly with autobendknees turned on. Fortunately that can be turned on/off with dialogue triggers. I can't play SDT without that mod, I even have tons of folders where I can select nearly any age for each of my girls.
Also, these
two mods do a good job of making her sound younger too. CV1 sounds more like she's panicked and having trouble while CV2 she sounds more comfortable. You'll need the
audio replacer to be able to change them as desired.
If you're looking for dialogues,
edgelord 3000
has some really good ones out, but he hasn't worked on any new ones in a while.