I am planning a spring DLR trip with my DD and MIL who has some back issues. Between DLH and PPH which is the closest to the maingates?

The walk from PPH looks like a little bit of a hike on google maps, but DLH doesn't look much closer. On the ground is there a big difference? Would it be troublesome for a 65 y.o. lady with a bad back?

I know the GCH is the closest of them all, but I don't know if my MIL wants to go into that price bracket. Is the closeness and private CA entrance worth the extra bucks?

Thanks in advance for any info and opinions.