To answer your question of giving NTG without IV, I would say if that is the road you are persuing then yes, I would be comfortable giving NTG without IV. Her sysstolic is 110 and her map acceptable to give nitro. How did she respond to her own ntg, did she fall on the floor? Her chest is clear so if you need to lay her down because she drops her pressure you can do that. This stuff is not etched in stone, you need to think about what your trying to accomplish, take the workload off the heart, but , don't increase the MVO2 by dropping the pressure to far (risk/benefit). If it was her first time ever with NTG I would be more concerned with a possible pressure dump but....that's what they pay you to do, think. I would stay away from the MSO4 until having a line the concurrent histamine release might be more deleterious than uselful. In the end try to do the best you can for the patient like they were your own family. Out of curiosity, did you ask the Dr what they think about the NTG without a line?
Snake