We have somebody who doesnt really attack as much as tickle in our dojo but if you get into the swing of things he can get quite aggressive and the attacks are good,
have you thought that she may be scared of hurting you? it is a possibility, we used bokkens for the first time last night and having the technique done to me first i felt a little off doing it to my uke, who is like 3rd Kyo and can take it easily anyhoo but there we go, of course later on i was fine just wacking the technique on cause he's hard so he says (on your knees boy)
oother then that she may just be shy? have you jsut asked her to attack you like you just burned her favourate pet alive?
it works trust me