When overcoming objections, you must first get the truth. She wants to be in a relationship may be the truth, but that could be just an excuse to cover the real truth.
Perhaps she's scared. Maybe she has heard that it hurts the first time. Maybe there is some underlying guilt.
So, first determine the Real truth, then move to the next step: The Nudge
Webster defines nudge as a gentle push. You can nudge her in a direction she wants to go anyway. If you nudge her in a direction she doesn't want to go your pushing. Then you get resistance.
My suggestion.
Remain very low pressure. Sell her on the idea of taking it a little further, slowly.
Make out this time. Move to her breasts next time, etc. until you can perform oral sex on her. This should be great cause no one else has been there yet.
Your final move will be to execute the Indirect Nudge.
You must convince her to let you do something to her that may seem like you are going to have sex, but your really not. Basically, you tell her that you want to perform another form of stimulation on her. That is, with a condom on you are going to rub your don johnson back and forth along the OUTSIDE of her vagina. Assure her that you have no intention of putting it in. You just want her to experience the sensation.
After rubbing it here for a while you will notice her start to squirm a little. She may even try ti pull you inside her. Dont go, yet. The idea is to make her fight for it. Then she is responsible for the decision.
If she does not attempt to pull you in to her, you can enter in maybe a quarter inch. See how she reacts. I few moments later give her another quarter inch, so she remains comfortable. Repeat until you are all the way in.
This technique will also help her with the initial pain of being devirginized.
You may even consider explaining this approach to her so she knows you will not hurt her.
You make the trust sale
This information has been partly paraphrased from my ebook: SUpersize Your Sex Life. In the book is provided detailed instructions for handling every objection situation.