hi katie
i think reading the BW books would really help your questions and problems with both the getting rid of night feeds and how to deal with napping issues. this website is really a support for those who are already familiar with the techniques taught in the books. it is not supposed to take their place and teach everything you need to know!
at 7 mo your LO may still need 1 overnight feed, but doubtful she needs 2 feeds, especially only 2 hours apart. she may be waking at these times due to being overtired due to poor naps during the day.
does your Lo fall asleep independently for naps? if not this can be a reason for short naps and night wakings.
short naps are also a sign of being overtired and if she does only 15 -20 min naps this is most certainly the case. at 7 mo, typical day sleep is about 3-4 hours and 12 hours at night.
i think if you get ahold of your book and give it a good read this would really help you to understand the BW techniques and approach and then if you decide this approach is right for you and you have further questions we would be more than happy to help out.