|Yes, I can help. I use clumping cat litter, my chis like it and use it willingly, plus it's easy to keep the pan clean. Do remove the clumps daily but leave a little bit so she can sniff "I've gone here before so it must be where I'm supposed to go now".
Just as you would wherever you want puppy to eliminate, the method is the same.
When puppy wakes up, put her in her tray and praise her if she goes. After puppy eats or drinks, put puppy in her tray and praise her if she goes. After you play with her, put puppy in her tray and praise her if she goes. Before you put her into her crate or puppy-proof room, put puppy in her tray and praise her if she goes. When you let puppy out of her crate or puppy-proof room, put puppy in her tray and praise her if she goes. If it's been an hour or so since she went, put puppy in her tray and praise her if she goes. Notice a pattern here?
I used my bathroom while I was gone during the day and at night since it had a tile floor and I was using the litter tray. That way she could have food, water and her bed in the same room as her litter box. If you choose to use a crate instead, do not leave food and water in with her. Give her a chance to eat and drink 15 minutes to 1/2 hour before she goes in, and give her a chance to relieve herself. Once they eat or drink they'll have to go, and she'll hold it as long as she can, but once a dog gets used to messing its bed, it's very hard to break them of it, don't set her up to fail.
Reliably, within a few minutes of being released from confinement when you get home and/or waking up in the morning, she's going to have to pee, and probably a few minutes later she'll have to poop, same if she's had a nice long nap in the evening. If she doesn't go after a minute or so, let her get out of the tray but watch her, as soon as she makes circles or starts sniffing, into the tray she goes and "Good girl peepee/poopie in the litter tray!".
Until she gets to be around 6 months old, she'll have accidents, no dog is reliable before then, so you'll have to watch her like a hawk when she's not confined. If she does go to her tray all by herself and go potty, celebrate and praise her to the heavens so she knows she made you happy.
I also recommend using doors or baby gates to keep her in the same room or area of the house you are and put the litter tray in that same area, so you don't have to be out of her sight, this is also only until she is reliable and at least 6 months old. That's the easiest way to make sure she can't sneak off and go somewhere you won't find it, and maximizes the times you can observe her going where you want her to and praise her.
If you find an accident, just clean it up, yelling at her won't help, dogs don't 'get it' unless you catch them in the act. If you catch her in the act, tell her "No potty on floor", pick her up and into the litter tray she goes, "Good puppy potty litter tray". In either case, you will have to use something to deodorize the spot so she doesn't smell it and think it's OK to go there again. You need to get something especially for pet odors, Febreeze or Lysol don't do it.
As always, I recommend the book Chihuahuas for Dummies, the best book I have on the care and training of these adorable little creatures.