It sounds as if your presence is really hindering her ability to fall asleep. If you are absolutely against letting her fuss for a few minutes then I would leave her for at least 10 min, give her time to settle herself, then if she is really still upset, go in, tell her night night, then leave again. At her age having you in the room with her can be too stimulating. I mean if you really think about it, could you go to sleep with someone standing over you watching you, especially someone who you loved very much and enjoyed their company. Give her a little credit here, she may surprise you and drift off to sleep within 10 minutes. I believe she does know how to put herself to sleep if she is not waking up at night for you. All babies do have a lighter stage of sleep and even may come to full conciousness. If she did not know how to put herself to sleep she would call out for you. Just give her 10 minutes and see what happens. If after 10 minutes she is still really crying and does not sound like she is settling at all, then go in, say I love you but it is time to go night night, and then leave her again. Go in every 10 -15 minutes until she goes to sleep. And if it is like minute 14 and it sounds like she is beginning to settle don't go in because this will only upset her seeing you.
It is up to you how you decide to go about this, but it really sounds like you need to step back a bit and give your lo a chance to know that it is ok for her to go to sleep while you are not in the room.