What can be the problem with this 1997 Chrysler Cirrus?? Please Help!?

The car belongs to my mom it is a 1997 Chrysler Cirrus LX, only has about 58,400 miles on it. I'm the daughter, we don't know enough about cars to know what could be wrong, so if anyone could maybe help, we'd appreciate it...Thank You!
About 5 months ago the car started making noises whenever you go over bumps, and when you turn the wheel, and people told us it could be the struts on the car. Now, the noise has gotten louder, and no one knows what it can be. We took it to 1 mechanic and he told us we only needed new tires because the ones that were on the car weren't the right ones, and they weren't able to hold the weight of the front end. Also, he told us if it wasn't the tires then it could be something in the steering. So, we baught new tires and the sound still continues. Could the noise be coming from the ball joints in the front end, or could the car be running low or out of steering fluid? It only makes the noise loudly when turning the wheel slighty. Could the steering be grinding or rubbing up against something? The steering wheel doesn't shake or anything when started or when driving, it doesn't have any trouble making a turn, it doesn't have a delay to making a turn or anything, so what can cause the steering to make noises?

Could anyone answer this for us?? If you have any possible answers, feel free to email me (heidi) at xhnicole1021x@aol.com Thank You!