Of course she should cut it if and how she wants to - but she asked for opinions.

For longish straight hair, a straight-across cut is very attractive (to me, anyway). For curly hair, that wouldn't work at all.

You definitely want to be either long enough to ponytail, or short enough not to need to. The middle ground is damned annoying, and I'm very glad I'm mostly through it. (It's one reason I'm not cutting it - I don't want to go through it again next time I want it long.)

Though, come to think of it, you never do ponytail it except when you're working with power tools, so I guess either your hair is calmer than mine or you aren't bothered by it.