Is she underestimating?

I (28) am about to smash with this woman (37) on the weekend who was definite to state that only oral and anal will be on the table (not on her period). While being excited, I feel concerned about this, considering no one was willing to let me anywhere near their assholes, which indicates my dimensions.

There will be no surprises from me since I've sent some pictures from the package and those angles I've chosen were realistic, maybe even a bit intimidating too if I would have been the recipient.

She has the kinks, but I doubt she will bring on the pornstar performance necessary to accommodate the shaft.

When asked her about whether she can handle it, she briefly replied "yeah sure". I like the attitude, but also would rather avoid some embarrasment and awkwardness. When she first mentioned it, my reaction was "you might not be able to take it". What do you guys think?