Getting stuck in C and D positons in fastpitch

[strike4]

As a Rookie this year, I had a simular play earlier this year. Runners on 1st and 2nd, two outs. I'm in C position. Ball hit hard to F6, who bobbles the ball. She starts her throw to 1st so I start in to inside of diamond. About the time I get even with her she turns and throws to 3rd. I have to duck to keep from getting hit by the ball. Out of the corner of my eye I see F5 catch the ball and she goes for tag but runner slides under her. I call her safe. When play is over, the defensive coach calls time and ask if he could appeal my call to the plate umpire. I go to my partner and tell him I think runner was safe but did he see anything different than me since I was ducking the ball and had to make a quick call. He said he did not see anything different and to stick with my call. When I signaled safe again, the coach said it was a forced play any way and I blew the call. I said to myself, he's right it was a forced play and I blew it. Then I thought but she was off the bag and I made the right call after all. This could only happen to a rookie.