She is very young still and 45min naps are developmental and will get better when she is a bit older. Sleep training gets a whole lot easier around 5 months of age.
You could if you wanted to be more relaxed about EASY now and just keep the order of things, yk? Eat, then awake time, then sleep and that is already a good start and will give you a good ground for times you'd need to do sleep training.
I keep on hearing about those babies who STTN so early on, I personally didn't meet any of them (or their parents), but if there are those babies out there then I'd say that every baby is different, some are good sleepers and some need help. You baby is not less good because he doesn't STTN and you are not less mommy because of that.
I remember that in the early days there was a time I wasn't sure of EASY either so I dropped it and things got far worse for us so I went back to it.
I HTH for now, you can always post your day in an EASY format and we can have a look if something pops up, like not enough A time (therefore short naps) or something with BT.
Good luck!