BF'ing is hard work. Which is probably why she falls asleep when latched on and not for a bottle. Try undressing her down to her diaper, keeping the lights on, talking to her, and continute to try to cold wash rag on her feet. My LO is also ticklish on his lower back so touching him there worked well for us.
In another week or two your LO should get better at staying awake BF'ing if you keep practicing. Keep up the good work!