Visit Visa for mum to witness child birth

[Omoh21]

Hello.
I'm in the process of filling out a visit visa for my mom to come to the UK for 4 months as I am having a baby in December. My husband and I are both PhD students and I will be fully sponsoring her visit. My mum has not traveled outside Nigeria in over 10 years, so she has a virgin passport. Could anyone please assist with answers to the following questions?
1. Do I mention in the invitation letter that I am expecting a child or do I say she's just visiting us? I ask this because as a student, I cannot take official maternity leave and they may think she is coming solely for child care purposes.
2. For the budget for the trip, I have estimated about £1200 (Return flights - £600, transport around the city - £200, shopping - £300, miscellaneous - £100). Is this amount feasible for 4 months? I didn't include accommodation and feeding as she will be staying with us.
3. My mum can show savings of about N500k (£1000). She is in fulltime employment earning N260K (£540) per month after tax. She has treasury bill certificates that are yet to mature though. Will they have an issue with her savings (N500k) in comparison to the estimated budget for her trip? Regardless of the fact that she will be fully sponsored.
4. What other documents can she provide as proof of ties to Nigeria?
5. Please see the document list we intend to submit and advise.

Supporting documents (Mum)

1. National passport
2. 6 months Bank statements and pay slips
3. Proof of earnings (Letter from employer/employment letter)
4. Evidence of employment (Leave approval letter)
5. Evidence of savings
6. Breakdown of expected expenses (e.g. flights, transport, shopping, miscellaneous)
7. Detailed cover letter
8. Proof of ties to Nigeria (e.g. pension account, marriage certificate, landed properties)
9. Consent letter from husband


Supporting documents (Me)
1. Photocopy of current passport and visa
2. Letter of invitation
3. Six months bank statements and pay slips
4. Scholarship letter
5. Statement of student status
6. Utility bills and tenancy agreement (proof of address)
7. Birth certificate (proving relationship)
8. Proof of pregnancy (scan pics, anomaly scan showing date of birth, maternity notes)
9. Marriage certificate

I'd really appreciate detailed responses. Thank you so much.

[arcelli ann]

Hi.
What happened to your visa application? Did you mentioned about your pregnancy and you are not entitled to maternity leave?