Oh Lizzie, we have just come through that phase - it exhausted me
All ds wanted to do was hold onto someone's fingers and bounce. If we put him to sit down, he'd cry, put him in his seat, he'd cry, on the floor, he'd cry, you get the idea? I think it's perfectly normal, and now he can stand and cruise holding onto furniture, he's OK.
To get some respite, we used a walker (I know, controversial
), but I think an exersaucer would work too.
She will come out of this phase, and it'll be something else to worry about then
BTW, ds has only just started his version of crawling, so don't worry about that, either, it'll come in time.