Be truthful to yourself.
If you get questioned (although your example is leaning more towards you questioning yourself), then either change the topic because it makes you uncomfortable (true), or mention that it's something that came up in conversation previously (true), or just tell her this conversation is boring (also true) and escalate rapidly. Lead.
If you get questioned (although your example is leaning more towards you questioning yourself), then either change the topic because it makes you uncomfortable (true), or mention that it's something that came up in conversation previously (true), or just tell her this conversation is boring (also true) and escalate rapidly. Lead.