Issue with my friend

[itsalmostsummer23]

Just looking for some thoughts and advice really.
Its about one of my oldest best friends, we met at high school in the mid 90s.
Over the years she's struggled with her mental health but never wanted to get medical help or take medication. She "self-medicated" by turning to alcohol.
Late last year she moved to a new part of the country for a fresh start, sent me a text with new address but like an idiot I accidentally deleted the text before having chance to write in my address book :((
It's her birthday (a milestone one) coming up in a few weeks and I texted her and sent same messages on WhatsApp asking her to please send me her address again, apologised profusely for deleting original text with it on.
No answer from her. Text and whatsapp haven't even been read yet (3 weeks after sending).
She doesn't have social media, no mutual friends either.
She missed my birthday last month (also milestone one), first time in all the years we've been friends. No card or message from her.
I can remember the name of the area she moved to, just not the address :(
I'm not sure whether she's going through one of her periods of ignoring all social contact and efforts to get in touch (she has form for this), or whether something more serious might be going on.
WWYD?

Is there anyone else that knows her ?

I'd approach her family, or see if you can find a work email address.

Did you ring her? Has she changed her phone number

I can understand why you are concerned, however not to dismiss it too much, but if she has form for disappearing from contact for a while, this makes things look more positive. Perhaps she is in hospital or rehab with no access to her phone.

If there are no mutual friends, do.you know any of her family you could contact? You said you know the area of her new address? Is this area small enough you could travel to and ask around?

Try calling her instead of texting.