Personally, I'd bet on 'overstimulated' rather than 'overly tired'...
... it is uncommon for babies this young to fall asleep on their own. They are smart enough to know they can't survive if anything dangerous happens, but not aware of the 'safety' of glass and locked doors yet (and won't be for 2-3 years)...
What you may be experiencing is the transition from when the 'switch' works (when they'll fall asleep no matter where they are) to when it doesn't --at which time they have to learn to relax into sleep.
Research about sleep is pretty simple, and applies to everyone:
*don't do stressful things in the 'sleep' area (including crying in terror because you're suddenly left alone where the tigers may get you --do not look to infants for logic or knowledge of our modern world, just instincts)
*make sure the days are not overly stimulating, and ensure sufficient rest throughout the day (a brain that has been overstimulated all day will have tremendous trouble falling asleep at any age)
*make sure she's resting well throughout the day --and sleep when she sleeps so you're not going bananas when she's awake through the night-- specifically, do not limit naps by time (even if they start at 4pm) or duration... the better she sleeps, the more she will sleep
*calm your whole life down because no one sleeps well on prolonged stress: fewer outings, fewer visitors, fewer smells and sights and sounds and people and changes and textures, so she is not trying to deal with a whole new world every 20 minutes.
*when you want to go to sleep, turn the lights down, turn the noise-makers off (tv, computer, radio, phones, game systems) and leave the off for the night... put your feet up, talk quietly because it's 'all done now' and go to bed early enough to get enough sleep.
You may need to consider the possibility that she's already getting enough sleep and you're trying to put her to bed 'for the night' too early... if she's been awake and active for less than 1/2 your waking day, 7 or 8pm is probably 2-3 hours early for her sleep needs. It is uncommon for babies to sleep more than 6 hours at night, so if you want her to wake at 4am, 10 is a good time to start.
Count the total number of hours she's sleeping and expect it to add up to less than 15 in 24 hours... if she's having a 2hr morning nap and a 2.5h afternoon nap, and sleeping while you're driving somewhere or visiting or shopping once or twice for another 15-30 mintues, she's really not going to sleep more than 9 or so hours at night... which is 8pm until 5am.
Keeping her up because you're up makes more sense than trying to get her to go to sleep while you're still up and then hoping she'll stay asleep to a 'normal' hour.
She's going to be waking in the night for the next 3 years, whether you wake up for it or not... sleep when she sleeps, even if it starts at 7pm. You'll need it tomorrow.