i find that babies tend to get colicky around 3 to 4months onwards, reasons unknown....my boy last time also have cries which lasts 1 hour, even i tried anything AND everything, its useless....sometimes in the middle of the night at 3am he also cries for no reason and remains awake till 5am.....i was also so scared that the neighbours will wake up from his cries....so afraid....those days....think they might have been woke up by his cries (Coz its really loud) and nice enuf not to knock on my door nia~.....
but sometimes she has her quiet times also rite, your girl? Think its not a serious case of colic.
some tips for you to reduce her colicky cries:
1) Gripe water to reduce wind
2) Ru Yi Oil to rub tummy
3) Sometimes you need to feel her forehead, if its cold, it means she is having tummy upset and so you can apply ru yi oil on her tummy. Rub from top to bottom, towards the diapers area, downward manner
4) maybe due to teething discomforts?
5) IF everything else FAILS, bring her out for a walk, like you said she enjoyed car rides? It helps to settle down her cries. They will be distracted by the moving surroundings.
As long as she is eating well and not throwing up every feed, there is not much to worry about. But you will need to find time to relax yourself coz constantly hearing those cries will make us frustrated and will hate the baby....
All the best!