I recommend a dildo made of healthy materials, like silicone.Any link?
As for the size, don't go too big all at once.
I recommend a Shane Diesel dildo:
https://vibratoaredelux.ro/masturba...m4DS7sJEHdb9HlEkfzW3NTTFCnVGQp9oLkp3833Q8HBJG. She will be delighted.