Most likely, yes. You are charged under the law of knowing what is in your own lease agreement. Also, the manager was wrong about you not being liable if they rent the lease before your lease expires. A landlord may hold you accountable for any costs to lease the premised and any difference in what you were paying and what he was able to lease it for at the end of your lease term. If there was an option to terminate and be relieved of any potential liability for the balance of your lease term and the balance was long enough to make it valuable, then it was something to consider. You might have a chance of still getting the termination option if you write a formal letter, certified, return receipt, advising that she failed to provide you with that option and asserting that you are considering an action for breach of contract, negligent misrepresentation, fraud, etc. Frankly, I don't think these are great causes of action but it might cause the landlord to reconsider whether to just work it out with you so that you can be out with peace of mind.
You posted this last night. The answer has not changed since then.
Disclaimer: This answer is provided for informational purposes only, does not constitute legal advice, and does not create an attorney-client relationship. Actual legal advice can only be provided after completing a comprehensive consultation in which all of the relevant facts are discussed and reviewed.
It is the Landlord's option to include the early termination / liquidated damages clause on the written lease agreement. Then, it is the tenant's option to choose to take it or not to take it. look at your lease agreement. Did you check off the box or initial beside the option to lock in to the early termination /ld option? or did you check off the box / initial NOT to lock in the option?
If you did choose to lock in the early termination /ld option, then the manager was not right to ignore that option.
You probably should go see an attorney so he/she can review the paperwork and advise you further.
The terms of the written contract will prevail. However, I would definately get an attorney involved in order to negotiate the terms of your termination with her so that you can have a dignified and less expensive exit. Good luck