Being constantly dropped by a group, especially friends, can be very discouraging.
True, perhaps Group pace needs to be more hers, a lead from the back, trip..
AYH requires that, for their, hostel to hostel, bike tours. leader rides sweep.
Her regular bike has been a 1985 Bridgestone T-700,
The frame may just be too long, for a woman's body proportion..
Dove /northroad handlebar is a step in the right direction..
for too much top tube.