Current trend is just that-a trend( I was raised on condensed milk and karo syrup). You have to find what's right for your own child and the fact that she spit it out shows she wasn't ready.
Cereal in a bottle does nothing, as your sister found out. The consistency doesn't change enough to make a difference or if it does, the baby has to suck harder-either way it's worthless.
Good to see she's getting back on track....for now