[quote=@Foster]
Well, we did consider that Jenny would [i]try[/i] to make herself smaller for practical social reasons; using mad-science.

It could be that your girl would use a related approach (to make herself bigger) that could later be used as a story-arc.

Common sense is telling me to refrain from using anything called "Pym Particles"
[/quote]

One idea that has been rummaging in my head (backstory wise) revolves around her having a "caretaker division" revolving around two groups of alien-humanoids (both based off the Godzilla Anime series). They look very human-like in appearance, but they are actually two different alien races. 

The [url=https://wikizilla.org/wiki/images/c/c8/GMP_large-galugu.png]Bilusaludo[/url] are a technologically-experienced race that take care of Gojira's (or to be named Titania) nanometal suit.

The [url=https://wikizilla.org/wiki/images/a/ad/GMP_large-metphies.png]Exif[/url] are a more religious-based race that serve as advisors and diplomats towards the MGMA and Titania respectively.

Now why would they be significant to Titania? Simply put it - the plan is for them to have originally found Titania on the deceased Earth - living alone and seemingly without purpose. They would capture her and bring her with them, eventually presenting her to the MGMA as a pilot for an upcoming mech (to be called codenamed "MechaTitania"). 

This may sound a little complicated so if anything I may get rid of the Exif, but keep the Bilusaludo as the mechanical repair team. Idk how she could be made otherwise, but at this point I am simply throwing around ideas.

And Im fine with the size stuff. 25 Feet will be ideal.