Well this sponsor sounds like she would be a great friend. It is really nice having sober people around. If you do not find that she is helping you in the way you need - that's okay. Read the Big Book of AA, go to your meetings, talk to people, stay sober, and one day, hopefully soon, you will find a sponsor that suits you a bit better.
And about this woman who intimidates you a bit, that may be a good sign! I know most of my best decisions were ones that got my nerves going a little bit - she may even help keep you accountable.
Change can be a struggle, but you're in the correct direction!