I realize that we have a lot of work to do!!
You said it!! :lol:
I really think that before you try and tackle the night issues you should have a look at getting the LO onto EASY during the day.
That is because, at the moment, day feeds are random and naps are erratic - meaning that I guess you can't be certain that overtiredness/too much day sleep/hunger etc aren't the causes of the night wakings. If you can eliminate those concerns you can start to embark on addressing night wakings. Without a good, regular EASY routine in place during the day, it could take A LOT longer to achieve results at night.
Do you have a copy of either of Tracy's book's? They are a great place to start. Otherwise, you could have a look at the EASY board on this website. The girls there would be able to give you some great advice about helping this LO on to a routine. There are also sample routines for a 6 month old that you will find at the top of the EASY board which will give your friend an idea of what other babies the same age are doing during the day feeding wise and sleeping wise.
I think that the other thing that your friend can start to work on is getting the LO to start to fall asleep independently. To do that, your friend should start putting her LO into bed before the LO has fallen asleep. She can use pat/shh to help settle the baby and PU/PD if necessary (there is a board devoted to PU/PD as well if you need additional support in that area). The ability to fall asleep independently, and to resettle herself during the night, is a really, really important part of addressing night waking issues.
The last thing I would add would be to try and explain to your friend that Tracy believed leaving a baby to cry breaks the bonds of trust between parent and child, and will not help trying to teach the LO to learn how to sleep. I would suggest you recommend that, even though nights will still be rough for a while, as you are getting the baby onto an EASY routine and starting to teach the LO to fall asleep independently, she not leave her LO to cry. Instead, she should always respond to her DD, by using methods like pat/shh, replacing the paci and if necessary PU/PD to help the LO back to sleep.
So does that make sense? Have a look at the daytime first, and once we get some of those issues ironed out we can start to have a closer look at addressing the night wakings. Pop over to the EASY board for some ideas.
HTH, let us know how you get on.
Cheers
Jo