Interferrence?

[tmielke]

Happened today in a Varsity Game.

R1 on 1st, R1 leaves the base on the pitch, B2 Pops up to F3 who ends up standing over the base to make the catch, effectively blocking R1 from returning to the base unless she dives or slides back.

What can R1 do to get to the base. Is there interference if R1 makes contact with F3 while she is attempting to catch the ball?

Thanks
Tom