Generally when the sugars are high blurred vision does happen a lot so that is normal, remember to get her to drink plenty of fluids particularly water when this happens as it helps to flush the system, also what are you doing to treat the highs, are you giving her a corrective dose of quick acting ? And have the doctors advised how much to give ?
A good book for you to get is Dr Bernsteins Diabetes Solution, this covers lots of questions about type 1 so a handy reference particularly when the doctors aren't open ! Otherwise come on here anyone around will their best to help.