Good luck with the lease transfer. At 14.5k miles at only 9 months your sis is way over on the miles. You may have to provide a larger incentive than $1K to get someone to take this over since @ 20 cents per mile, she's already over 4,500 miles @ 9 months so is on pace for nearly 7K miles annualized...so you'd need an incentive more like $1,500 just to get the driver clear on miles. Then, you typically will have to provide another incentive on top of that just to get someone to take over the lease.
Daily: 2013 e92 M3 MW FR DCT ZCP / ESS VT2 650 S/C, MRF mid/Akra slip, ST BBK
Track/Airstrip: 2011 997.2 Turbo S PDK / 501 AWHP & 536 AWTQ Bone stock on a Mustang dyno
Beater: 2013 X5 3.5sport