Kali gets a bath about once a month but it's usually less cause she really needs it cause she loves to get dirty and in the spring she gets them more frequently cause she loves mud. Both ear cleaning and nail trimming are based on the dog. Kali tends to wear her nails down on her own so we just check them every once and awhile and trim them if they need it. Ears you'll probably have to clean the day after they've been in water and I'd suggest checking them at least every other day to see if they need to be cleaned.
I'm not sure about brushing teeth because we use a dental diet kibble as treats but I'd say as necessary. You definitely will want to brush every day and watch behind her ears, under her elbows and her hind end for matts as that's where they tend to be. Also make sure she dries out well after baths and playing in the water and take off her collar so the neck can dry out because it can cause hotspots as it did with Kali.