Your best bet for dose advice is Elizabeth who is not on right now. First what you should do is DO NOT FEED yet and retest again to see if the number is going up, staying the same or going down. If it is going up then you should be able to shoot but I don't know what sort of dose with the hypurin. If it is the same or lower, wait again without feeding and retest in about another 20 minutes to see what the numbers are doing.. You could try doing the @ Elizabeth and Bertie and that should send an e-mail alert to her.
ETA:
You did shoot a 12.6 a couple of days ago with the 0.75 dose, so you may be safe with your current dose, but you would need to be able to monitor her levels for a few tests before bed.