#1... have you signed an "exclusive buyer's agreement" with her? If so, you need to find your way to exit the agreement, before switching
#2... if she's not showing you the houses you like... have you communicated that with her. We're not mind readers, you know... if you're not being shown what you want... tell us, we're truly not interested in wasting our time, any more than wasting YOUR time.
#3... be clear, with your agent about ALL of your expectations. ie: I expect to received an electronic "hotsheet" from you, of all the available homes that meet my requirements daily.... I expect to have an email from you every third day... I expect to talk with you once a week.... I hope to view homes on Friday or Saturdays from the list you've sent me... I'll send you a list on Thursday, of which homes I'd like to see.... I do NOT expect to see anymore of those darn ranch houses without a den...
Feel free to spell it out in writing... by note, or e-mail, so there's no chance for misunderstanding. If after conveying those details, she's still not living up to your expectations, it's time to move on.
It is a two-way relationship, yes, and in order for it to succeed, both parties have to do their jobs. The buyer has to know what they want, and, failing that, through lack of insight of the market, or being a property virgin, etc. then the agent must be able to effectively collect the data they need to execute their side of the arrangement and steer the buyer through the process to a mutually beneficial conclusion.
In the Westchester market, I'm still meeting agents that are stuck in the pre-Lehman Brothers collapse mentality, ie. they're happy to show a house or two, but when its evident that it may not be a quick sell, then it's onto their mailing list you go and you'll be lucky to hear from them again. Also, the boom of the last several years has brought in what I would consider to be less than highly qualified associates to the fray because of the profit potential. I mean really, what does the county require over 6000 real estate 'professionals' for?
So, bottom line, it's a much more competitive market out their right now, and if you think you've communicated your requirements correctly, move on to a new agent. Better yet, check their credentials beforehand and choose wisely going in. How long have they been in business? Are they doing this full-time? Do they have all of the appropriate licenses/certifications? If they don't get what you need at this stage, imagine what they are going to be like going forward to closing.
Last point: Exclusivity arrangements were a fool's bet before and are even more so now, stay away from them.