Hmm. I bathe my guys regularly, as well as my parents dog who is a 150lb bull mastiff X that they adopted at over a year old.
Make bath time fun time!
Get your pup used to the bath. Everyday, get a yummy treat, hot dogs work great, and throw it into the tub! You don't have to bath her, but get her used to the routine.
This way you don't need to lug her into the tub. (I know she's a Chi, but if you ever get a dog over 80lbs like me, dragging them into the tub is NOT ideal LOL

)
If she can't climb into the tub on her own, pick her up and put her in, NO WATER! Talk in soothing but firm tone of voice. Many people get confused, and use "baby talk". This frightens the animal even more. Being the alpha, your supposed to exude, confidence. Not fear.
Feed her plenty of treats, and keep the tone light and happy. End every "dry bath" on a good note.
When it comes for real bath time, have plenty of cut up hot dogs ready, and don't make a big deal! Calm, confident manner is the way to go!