Welcome to the forum, first of all. Now, the advice.

Son, you need to learn to "accessorize."
She will show you, eventually, but get it right on the bike, for bonus points.

White bar wrap, white saddle. The cost is not an issue. It's for her.
Rustoleum sells a good rust remover at Walmart in the Auto Body section.
Then a good wash with mild detergent, like dishwashing stuff.
Degreaser, one of several, citrus comes to mind.
WD40 and a good rag, hard rubbing, will remove a lot of stuff you thought were frame defects.
Then a decent car wax.

Once you get the colors close, then make sure the bike rides with as little effort as possible.
That includes shifting, braking, pedaling, etc. Make sure the ride is comfortable, so watch your tire pressure.
You want her to get on it, ride it, enjoy it, and not have to fight it in any way whatsoever.

Do not ask how I know this.