J.S.
Okay, here's what I would do. Stop with everything that's scented regarding the body sprays and "girlie things" in the shower. She's not too young for her body chemistry to start changing for the early stages of puberty. Puberty isn't just about visible physical changes. Odors are often the first sign.
I would try her out with gentle washes and avoid talc powder at all costs. Especially if the intent is to put it in her underwear. It's associated with a higher risk of feminine cancers. In addition, if she has a yeast infection the yeast will thrive on talc powder. If she has a "moisture" issue down there, then she'll need to wash more often. The best wash for the vaginal area is WATER. Not soaps, not feminine washes, but water otherwise you risk irritation and UTI's and ruining the body's natural pH to where she'll require feminine washes for life.
Find a gentle deodorant for her underarms, unscented.
Take her to see the pediatrician to see if you can determine if this is a medical issue. If it's something the pediatrician can't figure out or handle, shell refer you to a pediatric specialist that can.
Until then, try to get her to increase her water intake. If she's dehydrated it could make her urine smell stronger and affect the strength of her body odor. Note if there have been any changes in her diet. Keep a food journal and activity journal. If she has any health complaints, keep those in the journal as well.