>>561294Hammocks may be advertised as double, but truly they are not meant for 2 people to sleep in. It's possible, but it is incredibly uncomfortable. It makes it impossible to move, and you're pressed uncomfortably tight to the other person. Sounds great it theory, but in practice it just does not work well.
Getting her a separate hammock is the only way to go. If she's smaller, a single hammock will do.
I have a Yukon Double. It's not bad, just like an ENO Doublenest really. Mine the attached stuff sack tore off easy, but otherwise seems well made.
Yukon makes a model with attached bug net. The XL bugnet model is the one to get, will give you more room.
A separate bug net works too. Bug spray on the straps will keep any ants from finding their way to you.
Keep in mind that cooler Temps mean you'll need insulation under your hammock. A sleeping bag won't cut it at Temps below 60. Plus, getting into a sleeping bag in a hammock sucks balls. Using an underquilt and topquilt is awesome because then you don't need to climb into a sack.
A small hammock for you GF could be a Grand Trunk ultralight. They're smaller than most, but I assume your GF isn't huge, and the Grand trunk is $20 or less on Amazon. I own one, it's awesome for the price.
To make it easy, get ENO atlas straps to hang the hammock. There are other cheaper options but few as simple.
Pictured: grand trunk ultralight in front, ENO Doublenest in back to the right. Yukon Double with DIY underquilt in back to left.