i think she looks incredibly horrible and fake...(i have NEVER said that about ayu)
anyway, about the last part...there was nothing about handcuffs. online translators are so hideous. this is what was written.
「あー、これ、うまく出来てんのかな。。。
てか、あたし、日焼けすごいなぁ(^_^
」
she's showing the picture and talking about how they did a good job with her makeup and hair...then she says that she's pretty sunburned/tanned. i'm not sure which exactly as the two are sorta indistinguishable, i guess. 日焼け would typically point to sunburn but it can also be used to refer to being tanned by the sun.
also, i don't know if anyone here can read japanese or noticed, but the way she wrote in this is different from the way she usually writes. it's very "cutesy" and gyaru-ish. so maybe your assumptions about a PV are right and she's getting into a role?