Hi,
she's not weaning, she's too young. At her age, your baby needs breastmilk and solid foods - she is a big girl now - she knows how to get both. So don't offer her extra bottles or this will in fact lead to premature weaning. At this age babies are so "busy" - so much to look at. The bottle can seem so easy - when your little head swivels to look at something new - the bottle can just follow. But, just as when she has solids she has to "sit up at the table' - when she breastfeeds she has to sit up at the table too.
Many mothers notice their babies are less interested in breastfeeding in the 10-12 mnth range - but stick with it. After 12 mnths they often have a renewed intrest