What does princesa da mac dela oque bc ta fazendo acordada tao cedo assim em plen domingo vc ja esta se sentindo melhor te amo viv coisinha mean in english?

This is a Portuguese sentence, and it is very informal and uses slang. Here is a literal translation and then a possible interpretation based on the context:

Literal translation:

"Princess of Mac what are you doing awake so early like this on a Sunday you are already feeling better I love you viv little thing mean"

Possible interpretation:

The person is probably addressing a friend or loved one named "Princess," and they are asking why she is awake so early on a Sunday. They then seem to be expressing concern for her well-being, suggesting that she has been unwell and wondering if she is feeling better now. The message ends with a declaration of love and perhaps a bit of playful teasing ("mean" is a slang term for "cute" or "adorable").

In short, this sentence is a message from someone who seems to care about "Princess" and is checking in on her.

However, without more context, it's difficult to say for sure what the exact meaning is.