I am a Cocker Spaniel person. I have two snoring at my feet right now, and I’ve had many more in the past. I’ll never have another breed of dog. They are great dogs. All of mine are pound puppies or rescues.
Every dog is an individual, but my experience has been they are a medium-energy, great Velcro dogs. They want to be near you and are up for adventure but not crazy-crazy needing hours of exercise. They are the perfect companion size to have and to handle. And my dogs neither bite people nor submissive pee. Yours is a cutie, she looks more English than American (I love the English ones!)
Their coat is a pain, I groom my own now, every 6 weeks or so I clip them down into my version of a puppy cut, where the top half of them is shaved to the skin, ears are trimmed so there’s just the slightest fringe on the bottom, and I leave just a little hair on the bottom half of the body to imitate a normal cocker cut, but it’s trimmed down to maybe 1/2" inch. They don’t look as great as when a groomer did it, but it’s low maintenance and much more economical and works fine. I don’t think it’s a super big deal, it takes maybe two hours per session – to clip, bathe, trim nails, all that good stuff – and I don’t groom them in between. Back when I had my one dog in a full show coat, now THAT took a lot of effort (brushing every day and constant care/attention).
As far as their ears, I make it a habit of sniffing my dogs ears whenever the opportunity presents itself, about once a week. Like lift the flap and take a sniff. If it smells like nothing you’re good. If it has even a whiff of a cheesy smell, it’s the start of an ear issue. I use Zymox Otic Ear treatment (you can buy it on Amazon) and do a squirt at breakfast and a squirt at dinner for about 2 weeks, squirt it in and then rub the ear so it gets in. I’ve never had more serious issues using that method. The problem comes in if you leave it unattended.
Good luck and enjoy her!