If she's had a bad reaction to the Midazolam before, let the nurses know when they are admitting you, so if necessary they can make sure the Anaesthetist is aware.

Also, if she has had trouble with access before, make sure you let the nurses know that as well. They may be willing to contact the anaesthetist or registrar and have them come over and assess the best spot for an IV in advance, so the numbing gel can go over the right spot. Or if you see your anaesthetist beforehand, let them know.