If you do start adding cereal to a bottle just add a small amount to start like a tsp for a bottle so the choking hazard is reduced and it gets baby used to the texture

Ah ok I'll start on cereal in a bootle then, I'll slowly start showing her fruits and see if she is interested as you said.

Increase her feedings. Anything earlier than 4 months is not recommended and even then 6 months or more is ideal. This is why WIC only starts giving baby food at 6 months and not sooner.

She's really young, I'd try giving her more formula

And rice increases obesity so really don't do rice unless it's medically necessary

Every baby is different. They're ready to try when they start to show interest in solids. Give her a banana and let her examine the fruit before you try feeding it to her.

Do not do rice in her bottle she can choke! Up her formula intake and if that's not enough bring her to the doctors. The only time you should do rice in the bottle is if she medically needs to gain weight and Doctor says its ok

You could try rice cereal in her bottle but it has no nutritional value and might cause constipation

Way too early, most babies aren't ready until 5 months at least