I cannot find this but don't really know how to research possible sources for obscure stories like this. This might be from an old Analog Science Fiction mom had when I was growing up.
There is a great time travel short story about a man who can telepathically link to his future self and his past self. he starts able to just do a few minutes or seconds apart and works to develop the skill until he has a 2 week future and past self. He then proceeds to make tons of money on the stock market
He meets a woman who is fantastic but seems to block his temporal telepathy. He's overjoyed when he doesn't die after his two-week future self fails to check in, but concerned about this woman he starts dating around that time. She MUST be the cause of the block but he can't figure out how.
She has a necklace that prevents temporal shifts because she is un-stuck in time. she continually freewheels throughout time without control, and is only able to stay in one place because of the necklace.
He cannot make money picking stocks with her there, so she eventually agrees to use her freewheeling skill to get him copies of future newspapers so they can be together.
The story ends with the idea that maybe he can learn to freewheel with her and they can travel together and he thinks he's managed a few seconds at the end of the story.