It is 100% your choice. The only thing I would say is, is it possible you might change your mind when baby is here?
I know women who thought they weren't going to breast feed but when presented with their newborn, had the overwhelming urge to breastfeed them. I also know women who absolutely didn't change their minds.
If there is even the slight possibility that you might change your mind, would it be worth preparing yourself for that by reading some of the books she has given you?
If you could say ' look I'm pretty sure I'm definitely going to bottle feed, but I will read one of these books just to help me be totally certain, or just in case I do for some reason change my mind'
Also you could say 'look, if I did change my mind I would seek support straight away to get breastfeeding'.
It might also be coming from a misguided sense of her caring about you too, as the science does suggest breastfeeding is good for the mum too.
But ultimately you get to choose so she needs to respect whatever you decide .