185 is indeed high, unless she was sucking wind the whole time, even accounting for the higher max HR of an 18yo. Sometimes you get bad data and spikes if it's not making a good connection, like if you don't moisten the strap first. For example, here's some info from Garmin. So try those things first, and see what happens. Might also want to just try checking her heart rate manually after a short jog to compare.