Gravid female?

[GemmaD]

I wondered if I could please ask for some advice about one of my adult female tortoises? She weighs over 2 kg and I have introduced her to our adult male this spring. For a couple of weeks now, our usually quite and gentle tortoise has been butting and mounting the other tortoises. I assumed that might be because she's getting ready to lay but she's shown no interest in digging anywhere. They live in a greenhouse with an outside run and I've set up an area of deep, loosened top soil, with a slight slope underneath the lamps. Is there anything else I should do? Is it beginning to get too late in the year to lay now? Thank you for your help!