[Hearing River's name makes her remember that the other woman is there too. And she's the Doctor's wife, which only makes her feel more guilty about everything. Her feelings for the Doctor and the way she's made herself important to his very existence are things that she should be ashamed of. She's not, though, and won't allow herself to be.]

His face was the last thing I saw before waking up here. You had just -

[She hesitates, pulling back just enough that she can look up at him. Tears slip down her cheeks, but she's not ashamed of them this time. They can freely fall, and she doesn't care.]

You had just regenerated. The Tardis was crashing. When I woke up here, I thought maybe I had dreamt it all. I was so desperate not to lose you after you changed into someone else in a blink of an eye that I didn't care you were from before me. I was happy pretending we were on the same path together, because finally we were again. We were here together. Nothing else mattered.

[Not her own regret to undo. Not her personal goal. Just getting to have another chance with him where he was just the way he is now, bowtie and floppy hair and and hands that fit perfectly in hers.]