I would suggest that you talk to the SENCO about what works for your DD. My DS has had a computer since Y7, but the ruddy thing is a boat anchor and slower than a frozen snail. They even deleted the Windows 7 it came with to install Windows XP 
After the computer being totally useless (it would not boot up due to "lack of available memory") through half of Y8, at Christmas I took advantage of the sales and bought him his own computer (was supposed to be for home, initially). This year (Y9), however, to ease his frustration, he has just been using his own computer. He doesn't have to play the incompatibility game that way, and can complete work he starts at school once he gets home. This was the easiest option for us - his "school" computer sits on a shelf in the SENCO's office and collects dust. He knows that if it gets destroyed, it is his issue, not the school's (I have already had to replace his monitor after it got cracked - but it wasn't very costly).
Many families are not willing to do this, though - and frankly, appropriate and accessible tech should be available when it is suitable. Perhaps, if you have a word with the SENCO, you'll find that it is well received. Maybe it is as simple (at least for interface) as plugging in a full sized USB keyboard to her netbook in the short term. Well, that, and demonstrating how long it takes for the machine to boot and get to a point that it is usable - honestly, how much time is wasted in a school day waiting for it to "wake up"?
Ask the SENCO to have your DD's netbook handy when you meet - turned off, and stowed away. Start the meeting with it off, and ask her to take the minutes on the netbook. Clearly, this will not be possible, but it should help to demonstrate how difficult it is for your DD to keep up when the tech that is there to support her lags terribly.
If, however, it is not as bad as your DD reports, you'll see that, too. Sometimes, as tough as it is to admit, our kids may exaggerate a problem due to their desire to have something that is preferable to them for a reason they cannot verbalise otherwise. If that is the case, then there is another (likely very valid) reason why she is resisting the netbook, which you'll need to try to tease out.
All the best.