Betsey, also 18, has just started a psychology course at the University of Greenwich, and lives at home with her parents in London.
She loves her course so far, and much prefers it to her time at school and sixth form.
That's largely because it was only in Year 12 that she was diagnosed with autism - and missed out on extra support up until that point.
"I feel like I was disregarded a bit," Betsey says. "But it's also because schools just don't have the resources and funding to cater for all the needs of Send students."
The government has said it wants more students with Send to stay in mainstream schools.
But Betsey found the loud environment and social side of mainstream secondary school difficult, which she says had a big impact on her attendance.
"I experienced autistic burnout," she says. "So I was really struggling to get to school and stay throughout the day."
"I started going less, and having meltdowns before and after school, because I couldn't cope with the environment."
Betsey wants other late-diagnosed autistic girls to ask for support when they're struggling, so that they don't "slip under the radar".
"I think a lot of autistic people maybe don't push for the support they want because they don't want to be an inconvenience or cause problems," she says.
"A lot of it is down to masking. Pretending you're not struggling, fitting in with social norms."
"It might come across that they're not struggling when they actually are."
Though she's doing well now, and receiving lots of support at university, Betsey wishes it had come earlier.
"I think it's kind of frustrating to know I could have got support throughout school and earlier in my life."