I would also recommend a wand in these circumstances. A good rechargeable one. The Mantric is my favourite but obviously there are lots to choose from. Not currently on sale but it often is if you keep an eye out.
Every one is recommending a wand so would agree with that. If she likes the feeling of something inside her try going for a vibrator that may be looks/size wise same as a penis.
A good cheap option may be a bullet but may not be strong enough (power wise)
Can’t disagree with a decent wand, would be a great choice plus can get attachments, so plenty of fun to be had with that.
Based on what you mentioned with humping and grinding without insertion, thought I’d stick another suggestion (granted, not cheap) into the mix:
I don’t have one myself, but has one review on it. It’s something I’d be tempted to get my OH some time in the future I think.