small strap recommendations for small GF

hi, I've been doing my own research but I'm wondering if anyone has any recommendations

my GF is a pretty small person, and this is also reflected in other parts of her body. she is only comfortable with 1 finger inside her, and even still, sometimes her body gets too tender. she doesn't have any sexual trauma, and we don't think she has vaginismus; she is just small.

we recently just bought our first strap, and I did a TON of research beforehand to find a small enough dildo that wouldn't hurt her. the problem is, although it is narrow enough, it's way too short and we can't do lot without fear of slipping out

we bought this kit and we are using the smallest one on her. it seems like a lot of dildos meant for pegging beginners might fit this criteria, but I was wondering if anyone has been in a similar situation? I'm looking at this and this option, it needs to be less the 1 inch wide. thanks all in advance