welcome to FT.
you have plenty of time. how do you move the kid? is the 2 yo mobile, or does she need to be on wheels. I have never gotten much help at fra, and it is full of escalators and broken elevators. the only elevators I have ever found to work at fra only go down???
just find out where(gate letter and number) you have to go, keep the kid tight, as the place is very busy, and check and follow all the signs to your new gate.
I have been through the place many times(20 or 40), but I have no idea how it is laid out, I just follow the signs. I only know a trick at the c gates.
As i said eariler, I have found very little assistance, but you should not need much.
there is considerable discussion of fra on the lh site, and a lot on ua. read those posts, and if still confused, as a question there. the lh people never go home they only shuffle between fra and muc.