Hi there! Glad thing are looking up! How old is your LO? Sorry you might have already said
If you want to tackle nightwakings altogether, you need to teach her independent sleep and while its good to have naps outdoors so she gets used to it, if you do this all the time she wont know how to go to sleep on her own.
there are many methods and tips if you are interested in sleep training to be applied as per age.
I can only admire you for doign it with 2 kids, very brave!!
to answer a few of your Qs, things with DS are ok, we'd pretty much got the sleep sorted but then he caught a bad cold and is now a bit of a handful but I will go back to sleep training when he is over his cold.
My most imp advice is to get her on an EASY schedule as it will help A LOT, I know its hard with 2 kids but on other boards they have plenty of excellent advice. Once shes on a routine it will be easier to tackle the sleep issues. for example, for naps, you can try wake to sleep to extend them or adjusting Activity times.
HTH