Having played Amanda, I can safely say that she is one of the most powerful characters in the game, and one of the strongest Seekers as well.
Let's say there was a gator who's ability was simply "draw an additional card each turn." That would, rightfully, be seen as quite powerful. Let's say there was a gator who's ability was "on each turn, choose a Skill card in your hand. You may play it up to three times this round, at no additional cost." That would also, rightfully be seen as powerful. Silas is great, and this is simply a stronger version of that.
Amanda does both of these, and does them while stationed in the fundamentally strongest class, having access to all of the benefits Seekers have, as well as various powerful Practiced skills such as the new Promise of Power or Three Aces (with experience).
One thing I have noticed when seeing others evaluate Amanda is the belief that she has low stats. She sure doesn't feel like that when she is played. Due to drawing an additional card (or more, if you've got Dream-Enhancing Serum, you will regularly have a card with good, or great, icons to slot underneath you. If your deck is built right, you will often have between four and six to the stats you care about on a given turn, or all of them (Promise of Power is really, really good.)
You can regularly have The Red-Gloved Man, without spending neither resources nor experience, just by playing your gator. You can fight, as Vicious Blow and Overpower are both Practiced skills. You can be pre-Taboo Rex, or better, by putting Deduction or Deduction underneath you.
You can take Amanda Sharpe in a myriad directions, and no matter which direction you take her, you will likely be successful. I'm personally partial to taking the regular Seeker route, abusing such cards as Practice Makes Perfect, Astounding Revelation, and Eureka! in order to draw through a deck incredibly quickly. Putting Eureka! or Perception underneath your investigator means you can fairly easily, comfortably, draw five cards in a single turn, Once you've spent experience, this lets you assemble Pendant of the Queen and Three Aces quite rapidly; without the newest Taboo list, you can quite comfortably play three copies of Three Aces every other turn.
In short, Amanda good. However good you think she is, she's better, and if you are not careful, she can quickly take over an entire game and overshadow other players. Be careful when you play her.