Owner financing to spread out Capital gains tax

I’m trying to buy a property from a lady. This property is payed off, she said she won’t sell it because the capital gains tax is to much.

I thought if we structured a owner financing deal she could divert the capital gains taxes over the duration of the loan?

So I’m trying to find out who to talk to and get a little guidance on what to do.

Also I’d like to hear if any of you have got around this hurtle.

Thanks!