If baby is sleepy and not waking to feed regularly, then it's generally recommended to wake and feed at least 3 hourly. The average number of feeds in 24 hours is 8-12. They don't have to be evenly spaced - and healthy babies fed on demand will rarely feed at regular intervals.
If you can get your baby to wake up and take more milk, after a few days you'll probably find that her behaviour changes quite markedly and she will start to become more 'demanding' on her own, which will be great.
you're an old hand at this, so you probably already know enough to know whether your baby is going alright or not - just watch those signs of adequate intake. How many poo nappies in 24/hours? Any awake/alert time? (this will improve as she gets more milk) Weight gains/growth? Filling her skin, looking 'right'?

Swapping sides like this can be a good way to keep baby interested in the breast. Once she's waking herself and demanding milk, then you can simply follow her lead on how often and how long and how many sides, but in the mean time encouraging maximum intake is probably a good idea. For each feed, it may not be necessary to time each side, as such, but rather watch for signs of active feeding - big swallows, with rests, and then more swallowing - as opposed to fluttery, comfort sucking, which is when you might want to wake her again and either pop her back on the same side or switch her, depending on how it's working (you can figure out as you go which is working better).

There's no harm at all in comfort sucking - in fact it's really good for babies, so not discouraging it, but when baby is sleepy and perhaps not getting enough milk it is something to look out for when trying to encourage more intake.

Sounds like you're on the right track