I'm sorry about the CKD diagnosis....I know what a shocker it is. Trixie was diagnosed with Stage IV CKD totally out of the blue almost 2 years ago...we didn't have any warning at all! You've gotten a lot of good info, but here are a few other little thoughts:
Have Ivana's blood pressure checked. High BP often goes hand-in-hand with kidney issues, and sometimes getting BP under control can actually improve kidney values. For Trix, getting her BP into the normal range improved her values from Stage IV to Stage III so it can make a big difference.
Trix is diet-controlled diabetic at this point, and I want to keep her that way! At the same time, the only foods she'll eat is Fancy Feast and Purina One, both of which are about the worst you can get as far as phosphorous goes - not good at all for her CKD. But, since eating is, of course, vital, I use a phosphorous binder to help lower the phosphorous in her food. This helps significantly, as she can continue to eat the food she likes, and she eats quite well because the phosphorous is in a better range. So if Ivana is fussy about food and will only eat things that are higher phosphorous, know that there are options out there that can help.
CKD can cause stomach acid and/or nausea, so keep an eye out for those sort of things. Again, there are a variety of ways to treat them. For Trix, I use Pepcid and Cerenia on a strict schedule to stay ahead of any issues, as it can be too hard to catch up from backsliding. Others have had very good luck with more natural remedies such as slippery elm bark. So staying ahead of upset tummies and keeping them eating are very important.
SubQ fluids are a big help with that, too. Dehydration - even mild dehydration - can cause nausea and appy issues.
Ultimately you'll figure out the right combination that helps Ivana feel her best. It can take some trial and error, but I am sure you'll feel comfortable in no time.