Good advice above BUT: I would start be getting her to a vet right away. peeing like this, especially when she is suddenly no longer using the pads, sounds very possibly to be a urinary infection and she would need medication to treat this or it will get worse.
If that is eliminated as a problem, then I'd really use a good guidebook. Pads are IMHO always a terrible approach (though ingrained in books and trainers as a 'normal approach, unfortunately!) simply because you are still training her to pee in the house, and then have to train all over to go outside. Pee pads are generally discontinued as well much earlier than 5 months so she is really going to be forming a permanent habit of going inside.
The other issue is simply, management. Why does she have so many opportunities to get to carpets and relieve herself? She needs to be more closely watched and limited in where she can go if she is having regular chances to go on carpets and around the house. I suspect you like many of us guessed she was much further along in training based on a few good days or even weeks of few to no accidents whereas housetraining as Nicki notes takes months and needs constant supervision and control at that time. Shut doors, confine her to the room where you are, and have her in arm's reach at all times or crate her. Given the frequency of accidents I would start at the beginning again and proceed carefully. Dogs can take a year to be fully housetrained and even then the odd accident often happens. I think she is really too young to be doing behaviours to signal she wants to go out. Mostly it is circling around, sniffing the ground. If she isn't doing this then I think she may well have a UTI. Most cavaliers in my experience do NOT give signs like barking, to let owners know they wan to go out - unless you specifically train them to do this.
Of my five only ONE will bark and then only sometimes.I take them al out 4 times a day on average, on a regular schedule. Dogs love schedules and it really helps them to know when pee-time happens.
Have you downloaded the free Dr Ian Dunbar book I have linked to before? I think I recommended this already to you and gave you the link? This has great advice on housetraining and all care and training issues with puppies and is highly recommended. These are the months when you will shape the adult dog you want to end up with and the same opportunities won't be there, and won't be as easy, once she reaches a year old. So it is great to have a helping hand like Dr Dunbar within reach!
It sounds like you have a lot of time with her, which is great, so using a book like Dr Dunbar's will let you use that time most effectively in her formative stages to end up with a great, well-behaved dog.