I doubt going to bed at 7pm means going to sleep at 7pm. Bedtime used to take the best part of an hour at 4 especially if it included a bath. Even without bath it's 30 minutes for a wash, teeth, pyjamas, story, tucking in, little conversation, last goodnight...
4 year olds need between 10 and 12 hours sleep so some might well sleep through until 7:30am.
Others will of course have had enough sleep by 5:30am
Preschoolers have a natural circadian rhythm just like adults, and some are naturally early to bed, early to rise, while others naturally fall asleep later and wake later. You can only change that up to a certain point.
I had two natural early birds then dc3 was not only a poor sleeper but a natural owl who had his longest, deepest stretch of sleep interrupted by his siblings waking up fresh and full of energy to start the day - it was virtually impossible to synchronise them until dc3 was about 6 or 7 and they met somewhere in the middle (but the older ones still choose to go to bed when the youngest does and the 13 year old still gets up by 7am at weekends (and has often done his weekend homework in bed before 7am as he's still not allowed to wake anyone else or use screens before 7am)...
Obviously the OP does need to be in bed by 10pm, and ideally a bit earlier a couple of nights per week, but scolding her for not wanting to go to bed at 9 and get up at 5 doesn't help anyone AgathaVanHelsing - it's the same sanctimonious nonsense as telling a child who is tired and unhappy in the middle of exams or friendship problems that your schooldays are the best days of your life and you should enjoy it while it lasts!
Mine are aged 8- nearly 15 now and are playing a card game together, all in the same room as us. The OP's DD will want to spend time with her for a good decade yet, and it only gets better.
Children old enough to tell the time, follow rules, go downstairs and make themselves breakfast and sometimes make their parents a coffee are the best
so much to look forward to after the sleep deprivation ends!
But yes, audiobook s helped us to - the kids all still use them. We just have big basic cd/radios in each room - I'd be worried about strangulation risk with headphones. They have them on very quietly.
You can get pillow cases with a tiny pocket for a mini speaker meant for playing relaxation CDs though. We had one at one point with the little speaker but never really got established using it.