I hate to parrot everyone else here, but when they are right...It all depends on the person.
I have to break for dinner. Bad timing.

I will be back with some links/resources that may help.
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Hopefully some of this information will help.
http://www.rainn.org/get-information/index.html - Clinical information regarding the effects of rape
http://rapedlostalone2.blogspot.com/ - A personal blog from a rape survivor. I have read through a bit of it, it is pretty intense, but it will definitely give you a good idea of what one woman went through during the healing process.
http://www.survivingtothriving.org/mainpage - Just has some good information, resources, and links.
http://www.healthyplace.com/communities/Abuse/lisk/index.html - More personal accounts.
Part of what you will need to decide is how far your character has come in her healing process. Is this her first date after the rape? How long has it been since the rape? Although length in time does not always depict a "stage" in the healing process, it does affect where your character's mind would be. If it has been quite a while since the rape, your character my feel that she should damn well be ready to date, even if she isn't. Which, unfortunately, cycles back to feeling guilt about "not being over it".
A few actions that the person your character is dating may perform that may throw your character "off".
- Any action that can be interpreted as being forceful. - Grabbing your character, holding on to her arms too long, etc.
- Any action that resembles actions performed in the rape. - Say the woman's attacker had their hands around her throat during the attack, the woman may have a hard time with her now date brushing their hands over her neck, especially during an intimate moment.
- Comments that can be construed as derogatory towards women, or construed as placing blame on a woman for being attacked.