Re: She's a natural born hammocker, me not so much.
Bivy sac.
There are some "nice" ones and it will be lighter and smaller then a hammock.
I would use one instead, hammocks seem like the go to, light weight answer... But by the time you have quilts and tarps and lines... It just usually isn't. Its usually at that point you realize that your fine with the added bulk/weight because sleeping on hard flat surfaces sucks.
Unless your you, lol.
Comfort is the reason many of us stuck with a hammock even after realizing the assertion that it was the lightest most packable option was wrong... But your not comfortable. If you are somehow comfortable on the ground you can meet your originally stated goal better on the ground, in all honesty.