So I've been with my gf for about 8 months and she's currently on holiday for a month in brazil with her family, we've been chatting a bit but the conversations keep drying up, she hasn't been having a great time so far and her family keeps bugging her, so she says! She has always gotten into depression like states and appears to be in the same way. The times we have spoken every time she bites at something I said and is now saying she feels distant, there isn't an emotional connection, we just have a physical relationship.

She's told me she has to speak to other friends including a guy (he lives abroad so less of a threat) to help improve her mood when she's like this.

Throughout she has said she loves me and that it's fine that we have less of an emotional connection.

Finding it difficult to improve the situation when I can't see her as normally I'll just hug her and mess around to cheer her up.

She's now said that she wants some space for a few days and that she doesn't want to speak to anyone including me.

We are meant to be going on holiday when she gets back in 2 weeks time but its going to be a nightmare if we haven't sorted these problems out.

What shall I do? I get the feeling that the relationship is heading towards its end. Should I pre empt it or see how it goes when she's back? I wanna try sort things out but I think it really depends on her mood and not anything I say! Shall I message her whilst she is on getting her 'space'

Luckily I booked flexi flights for this holiday so might have to bail out of it if it all goes sour.

you tell me. it’s not that i have enough information to tell you anything.
What shall I do?

again, not enough information. may be she is not saying to you some things either. may be she already had sex with another guy and simply is changing you for a new guy.
Should I pre empt it or see how it goes when she's back?

If she's asking for space, respect her wishes. I know its tough, I've been there several times myself.

Either she'll come back to you realizing she misses you so much and is open to working on things w you, OR she'll realize the relationship isn't for her and let you move on. Either way its a win-win situation. By not respecting her need for space you'll only prolong matters and revisit this later on if by then she hasn't withdrawn entirely from you.