Q: Gear shifting problems

I got this car about 3 years ago with 90,000 miles on it from a one time owner(older woman). The car hasn't really had any major issues, especially transmission issues. At the most, just replacing the starter and the usual brake changes and spark plug changes and stuff. I will also add that after about the 2nd year, the car has barely had any clutch left. Maybe about 2 inches in the pedal. Well, about 6 months ago I got in it to go to work and the shifter was really loose and for some reason I didn't have 2nd, 4th, or reverse. Only 1st, 3rd, and 5th. I sat there and kept trying to go through the gears and now I've got all gears except first and second. When I try to go into those gears it doesn't pop back out or grind or anything. It just won't go into them. I checked my trans fluid and topped it off and looked at the linkage right under the leather cover on the shifter and it seemed fine. I'm puzzled on what is going on with it. I'm hoping it's an easy fix I might be able to fix mysel

My car has 120000 miles.
My car has a manual transmission.