I’m your height, 5’0” though heavier. That’ll be another thread. I’m still 175 lbs though since retiring the pants sizes are dropping. I was rocking size 16, now down to 12’s. The goal size is either 10 - maybe 8. It’s what tends to happen with me, weight stays the same and everything turns to muscle when I get fit. Anyway back to the bike;

My commute may be similar to yours; pavement and bike lanes with some gravel. My favorite commuters are my Salsa Vaya and the Soma Buena Vista the latter of which is a Mixte. Since you want to to cross the Salsa May be a better choice. Equipped with a rack and front and rear fenders it’s heavier than some. Test ride without and with lighter wheels.

I normally ride a 47cm, my Salsa is a 50cm. I’ve had I professionally fit and was surprised by that.

Here’s another thread for comparison and info:

http://forums.teamestrogen.com/showthread.php?t=51616