In reply to unknownclimber6:
The key thing is good communication, and building up trust and confidence (for both of you).
Try fitting some clip-drop practice into your indoor sessions, and for outside, discuss how/where she'll belay you.
For clip drop indoors, start small, and give each other feedback on how each fall/catch went, and try and ensure each fall is a positive experience. Also If she bends her knees/squats when she's expecting you to fall, then her being 'pulled to her feet' reducing the flying lession she'll recieve on larger falls (and prevents it on smaller ones).
For indoors leading, IMO this is a lot better than using a weight bag or her (constantly) bracing against the wall, as it give her the ability to move (to pay out/take in quickly). Another reason I'm not keen is that an anchor/bag/constant bracing (can) become a substitue for good belaying rather than a suppliment to it.
Outside (once you've clipped enough gear/bolts to not need spotting), she can even sit down on the ground: One foot flat on the floor (in line with the live rope), the other leg crowed behind it. This technique should take the sting out of all but the largest falls....
From experience: One of my climbing partners is ~7.5 stones lighter than me, and using this technique, a 5 metre fall only made her take 2 steps foward and lifted her onto her toes.